Finished lift kit, now have drive shaft vibration
02-12-2004, 10:45 AM
#11
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
Do the SYE (slip yoke eliminator) kit and put on a CV driveshaft.
Anything 4" and higher, the t-case drop kit is likely not going to get
rid of ALL the vibrations, and you'll be wearing down u-joints at an
accelerated rate (not to mention, if that axle drops fully off-road,
those u-joints will be likely to snap). It is somewhat expensive
(~$500 parts), but if you installed your own lift kit, you definitely
have the skills necessary to complete this task (it's not that
hard...I did it! lol), so you can avoid the additional ~$500 in labor.
And, as another poster stated, once you get the CV shaft in, you'll
have to shim your rear axle then, to point the pinion straight toward
the CV joint of the driveshaft at the t-case output flange location.
You can probably wait a year or so at least to do this, though, if you
want. I did. I just waited until the vibration in my rear driveshaft
got really bad from the high operating angles eating the u-joints,
then finally broke in and plunked down the dough to do the SYE and CV
driveshaft. Just be glad you don't also have to buy adjustable control
arms to aim your pinion ($250 more for me!)
Good luck.
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
Anything 4" and higher, the t-case drop kit is likely not going to get
rid of ALL the vibrations, and you'll be wearing down u-joints at an
accelerated rate (not to mention, if that axle drops fully off-road,
those u-joints will be likely to snap). It is somewhat expensive
(~$500 parts), but if you installed your own lift kit, you definitely
have the skills necessary to complete this task (it's not that
hard...I did it! lol), so you can avoid the additional ~$500 in labor.
And, as another poster stated, once you get the CV shaft in, you'll
have to shim your rear axle then, to point the pinion straight toward
the CV joint of the driveshaft at the t-case output flange location.
You can probably wait a year or so at least to do this, though, if you
want. I did. I just waited until the vibration in my rear driveshaft
got really bad from the high operating angles eating the u-joints,
then finally broke in and plunked down the dough to do the SYE and CV
driveshaft. Just be glad you don't also have to buy adjustable control
arms to aim your pinion ($250 more for me!)
Good luck.
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
02-12-2004, 10:45 AM
#12
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
Do the SYE (slip yoke eliminator) kit and put on a CV driveshaft.
Anything 4" and higher, the t-case drop kit is likely not going to get
rid of ALL the vibrations, and you'll be wearing down u-joints at an
accelerated rate (not to mention, if that axle drops fully off-road,
those u-joints will be likely to snap). It is somewhat expensive
(~$500 parts), but if you installed your own lift kit, you definitely
have the skills necessary to complete this task (it's not that
hard...I did it! lol), so you can avoid the additional ~$500 in labor.
And, as another poster stated, once you get the CV shaft in, you'll
have to shim your rear axle then, to point the pinion straight toward
the CV joint of the driveshaft at the t-case output flange location.
You can probably wait a year or so at least to do this, though, if you
want. I did. I just waited until the vibration in my rear driveshaft
got really bad from the high operating angles eating the u-joints,
then finally broke in and plunked down the dough to do the SYE and CV
driveshaft. Just be glad you don't also have to buy adjustable control
arms to aim your pinion ($250 more for me!)
Good luck.
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
Anything 4" and higher, the t-case drop kit is likely not going to get
rid of ALL the vibrations, and you'll be wearing down u-joints at an
accelerated rate (not to mention, if that axle drops fully off-road,
those u-joints will be likely to snap). It is somewhat expensive
(~$500 parts), but if you installed your own lift kit, you definitely
have the skills necessary to complete this task (it's not that
hard...I did it! lol), so you can avoid the additional ~$500 in labor.
And, as another poster stated, once you get the CV shaft in, you'll
have to shim your rear axle then, to point the pinion straight toward
the CV joint of the driveshaft at the t-case output flange location.
You can probably wait a year or so at least to do this, though, if you
want. I did. I just waited until the vibration in my rear driveshaft
got really bad from the high operating angles eating the u-joints,
then finally broke in and plunked down the dough to do the SYE and CV
driveshaft. Just be glad you don't also have to buy adjustable control
arms to aim your pinion ($250 more for me!)
Good luck.
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
02-12-2004, 10:45 AM
#13
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
Do the SYE (slip yoke eliminator) kit and put on a CV driveshaft.
Anything 4" and higher, the t-case drop kit is likely not going to get
rid of ALL the vibrations, and you'll be wearing down u-joints at an
accelerated rate (not to mention, if that axle drops fully off-road,
those u-joints will be likely to snap). It is somewhat expensive
(~$500 parts), but if you installed your own lift kit, you definitely
have the skills necessary to complete this task (it's not that
hard...I did it! lol), so you can avoid the additional ~$500 in labor.
And, as another poster stated, once you get the CV shaft in, you'll
have to shim your rear axle then, to point the pinion straight toward
the CV joint of the driveshaft at the t-case output flange location.
You can probably wait a year or so at least to do this, though, if you
want. I did. I just waited until the vibration in my rear driveshaft
got really bad from the high operating angles eating the u-joints,
then finally broke in and plunked down the dough to do the SYE and CV
driveshaft. Just be glad you don't also have to buy adjustable control
arms to aim your pinion ($250 more for me!)
Good luck.
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
Anything 4" and higher, the t-case drop kit is likely not going to get
rid of ALL the vibrations, and you'll be wearing down u-joints at an
accelerated rate (not to mention, if that axle drops fully off-road,
those u-joints will be likely to snap). It is somewhat expensive
(~$500 parts), but if you installed your own lift kit, you definitely
have the skills necessary to complete this task (it's not that
hard...I did it! lol), so you can avoid the additional ~$500 in labor.
And, as another poster stated, once you get the CV shaft in, you'll
have to shim your rear axle then, to point the pinion straight toward
the CV joint of the driveshaft at the t-case output flange location.
You can probably wait a year or so at least to do this, though, if you
want. I did. I just waited until the vibration in my rear driveshaft
got really bad from the high operating angles eating the u-joints,
then finally broke in and plunked down the dough to do the SYE and CV
driveshaft. Just be glad you don't also have to buy adjustable control
arms to aim your pinion ($250 more for me!)
Good luck.
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
02-12-2004, 10:47 AM
#14
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
BTW, I would have loved to see what that looked like, you driving
around with your front end lifted 4" and your rear at stock height.
Must've been an amusing site. Not to mention interesting to drive...
;-)
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
around with your front end lifted 4" and your rear at stock height.
Must've been an amusing site. Not to mention interesting to drive...
;-)
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
02-12-2004, 10:47 AM
#15
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
BTW, I would have loved to see what that looked like, you driving
around with your front end lifted 4" and your rear at stock height.
Must've been an amusing site. Not to mention interesting to drive...
;-)
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
around with your front end lifted 4" and your rear at stock height.
Must've been an amusing site. Not to mention interesting to drive...
;-)
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
02-12-2004, 10:47 AM
#16
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
BTW, I would have loved to see what that looked like, you driving
around with your front end lifted 4" and your rear at stock height.
Must've been an amusing site. Not to mention interesting to drive...
;-)
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
around with your front end lifted 4" and your rear at stock height.
Must've been an amusing site. Not to mention interesting to drive...
;-)
"William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
> and drove it till the next weekend when I put the rear half on. Everything
> was fine with only the front on. Now, with the rear on I get a vibration
> from the drive shaft it seems at around 40 and up. The when I let off the
> gas I hear a noise like a 10 speed bike would make when you are coasting
> only heavier, click click click click.... etc.
>
> The kit came with a transfer case drop kit but I didn't install it. Others
> I have talked to said they didn't use the transfer case drop kit.
>
> Has anyone else had this problem or can anyone give a comment or help?
>
> Thanks,
02-12-2004, 11:08 AM
#17
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
Actually, I didn't really realize it at the time but I had 2.5 " lift
springs on there from the previous owner. I'm running 32" tires. It wasn't
too bad, just leaned back a bit.
bill
"Bob" <magicclaw@mac.com> wrote in message
news:47b769ae.0402120747.2c82245d@posting.google.c om...
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> > First I put the lift kit (4" superlift kit) on the front end of my 83
CJ7
> > and drove it till the next weekend when I put the rear half on.
Everything
> > was fine with only the front on. Now, with the rear on I get a
vibration
> > from the drive shaft it seems at around 40 and up. The when I let off
the
> > gas I hear a noise like a 10 speed bike would make when you are coasting
> > only heavier, click click click click.... etc.
> >
> > The kit came with a transfer case drop kit but I didn't install it.
Others
> > I have talked to said they didn't use the transfer case drop kit.
> >
> > Has anyone else had this problem or can anyone give a comment or help?
> >
> > Thanks,
springs on there from the previous owner. I'm running 32" tires. It wasn't
too bad, just leaned back a bit.
bill
"Bob" <magicclaw@mac.com> wrote in message
news:47b769ae.0402120747.2c82245d@posting.google.c om...
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> > First I put the lift kit (4" superlift kit) on the front end of my 83
CJ7
> > and drove it till the next weekend when I put the rear half on.
Everything
> > was fine with only the front on. Now, with the rear on I get a
vibration
> > from the drive shaft it seems at around 40 and up. The when I let off
the
> > gas I hear a noise like a 10 speed bike would make when you are coasting
> > only heavier, click click click click.... etc.
> >
> > The kit came with a transfer case drop kit but I didn't install it.
Others
> > I have talked to said they didn't use the transfer case drop kit.
> >
> > Has anyone else had this problem or can anyone give a comment or help?
> >
> > Thanks,
02-12-2004, 11:08 AM
#18
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
Actually, I didn't really realize it at the time but I had 2.5 " lift
springs on there from the previous owner. I'm running 32" tires. It wasn't
too bad, just leaned back a bit.
bill
"Bob" <magicclaw@mac.com> wrote in message
news:47b769ae.0402120747.2c82245d@posting.google.c om...
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> > First I put the lift kit (4" superlift kit) on the front end of my 83
CJ7
> > and drove it till the next weekend when I put the rear half on.
Everything
> > was fine with only the front on. Now, with the rear on I get a
vibration
> > from the drive shaft it seems at around 40 and up. The when I let off
the
> > gas I hear a noise like a 10 speed bike would make when you are coasting
> > only heavier, click click click click.... etc.
> >
> > The kit came with a transfer case drop kit but I didn't install it.
Others
> > I have talked to said they didn't use the transfer case drop kit.
> >
> > Has anyone else had this problem or can anyone give a comment or help?
> >
> > Thanks,
springs on there from the previous owner. I'm running 32" tires. It wasn't
too bad, just leaned back a bit.
bill
"Bob" <magicclaw@mac.com> wrote in message
news:47b769ae.0402120747.2c82245d@posting.google.c om...
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> > First I put the lift kit (4" superlift kit) on the front end of my 83
CJ7
> > and drove it till the next weekend when I put the rear half on.
Everything
> > was fine with only the front on. Now, with the rear on I get a
vibration
> > from the drive shaft it seems at around 40 and up. The when I let off
the
> > gas I hear a noise like a 10 speed bike would make when you are coasting
> > only heavier, click click click click.... etc.
> >
> > The kit came with a transfer case drop kit but I didn't install it.
Others
> > I have talked to said they didn't use the transfer case drop kit.
> >
> > Has anyone else had this problem or can anyone give a comment or help?
> >
> > Thanks,
02-12-2004, 11:08 AM
#19
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
Actually, I didn't really realize it at the time but I had 2.5 " lift
springs on there from the previous owner. I'm running 32" tires. It wasn't
too bad, just leaned back a bit.
bill
"Bob" <magicclaw@mac.com> wrote in message
news:47b769ae.0402120747.2c82245d@posting.google.c om...
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> > First I put the lift kit (4" superlift kit) on the front end of my 83
CJ7
> > and drove it till the next weekend when I put the rear half on.
Everything
> > was fine with only the front on. Now, with the rear on I get a
vibration
> > from the drive shaft it seems at around 40 and up. The when I let off
the
> > gas I hear a noise like a 10 speed bike would make when you are coasting
> > only heavier, click click click click.... etc.
> >
> > The kit came with a transfer case drop kit but I didn't install it.
Others
> > I have talked to said they didn't use the transfer case drop kit.
> >
> > Has anyone else had this problem or can anyone give a comment or help?
> >
> > Thanks,
springs on there from the previous owner. I'm running 32" tires. It wasn't
too bad, just leaned back a bit.
bill
"Bob" <magicclaw@mac.com> wrote in message
news:47b769ae.0402120747.2c82245d@posting.google.c om...
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
> > First I put the lift kit (4" superlift kit) on the front end of my 83
CJ7
> > and drove it till the next weekend when I put the rear half on.
Everything
> > was fine with only the front on. Now, with the rear on I get a
vibration
> > from the drive shaft it seems at around 40 and up. The when I let off
the
> > gas I hear a noise like a 10 speed bike would make when you are coasting
> > only heavier, click click click click.... etc.
> >
> > The kit came with a transfer case drop kit but I didn't install it.
Others
> > I have talked to said they didn't use the transfer case drop kit.
> >
> > Has anyone else had this problem or can anyone give a comment or help?
> >
> > Thanks,
02-12-2004, 11:11 AM
#20
Guest
Posts: n/a
Re: Finished lift kit, now have drive shaft vibration
Vibrations are typically caused because of mismatched angles (I was told)
I solved that problem when I was doing a T18/Dana300 - T150/dana20 swap.
I used thicker motor mounts so the engine/tranny/transfercase pointed
downwards a bit more. I had to have a custom made skidplate/crossmember
because of the new driveline. What I did is, make sure that the
imaginary line of the outputshaft of the tranfercase and the imaginary
line "straight out" of the rear differential are close to parallel.
When that's the case then there's (almost) no difference in angle of the
u-joint near the transfercase and u-joint near the rear differential.
when that is done the u-joints cancel out each others vibrations.
The angle the u-joint has to overcome might "still" be larger then
"spec" but not having noticable vibrations keeps the u-joints and other
parts alive longer then having the same driveline angle problems WITH
vibrations. The guy in a shop that build my new driveshafts for after
the conversion told me that (and showed me).
According to him u-joints are supposed to operate between certain
angles, but (according to him) it is really important that the front and
rear ujoints have the same angle. He told me that the vibrations are
caused by [1] driveline angles that are too big. [2] teh difference in
driveline angle between the rear and front should be 180 degrees so that
vibrations can cancle each other out.
Also ... get real good u-joints.
I listened to his advice and my just over 1ft rear driveshaft that has a
pretty steep "angle" never caused any notible vibrations etc with my 4"
lift.
As for the front driveshaft, yes the angles are mismatched there, but
within the specs of the ujoints (rear driveshaft got real short, front
driveshaft got real long) besides I almost never drive "fast" in 4wd anyway.
Ron
btw: a CJ7 is about 12" longer, so you should be able to get rid of
that vibration.
Bob wrote:
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
>
>>First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
>>and drove it till the next weekend when I put the rear half on. Everything
>>was fine with only the front on. Now, with the rear on I get a vibration
>>from the drive shaft it seems at around 40 and up. The when I let off the
>>gas I hear a noise like a 10 speed bike would make when you are coasting
>>only heavier, click click click click.... etc.
>>
>>The kit came with a transfer case drop kit but I didn't install it. Others
>>I have talked to said they didn't use the transfer case drop kit.
>>
>>Has anyone else had this problem or can anyone give a comment or help?
>>
>>Thanks,
I solved that problem when I was doing a T18/Dana300 - T150/dana20 swap.
I used thicker motor mounts so the engine/tranny/transfercase pointed
downwards a bit more. I had to have a custom made skidplate/crossmember
because of the new driveline. What I did is, make sure that the
imaginary line of the outputshaft of the tranfercase and the imaginary
line "straight out" of the rear differential are close to parallel.
When that's the case then there's (almost) no difference in angle of the
u-joint near the transfercase and u-joint near the rear differential.
when that is done the u-joints cancel out each others vibrations.
The angle the u-joint has to overcome might "still" be larger then
"spec" but not having noticable vibrations keeps the u-joints and other
parts alive longer then having the same driveline angle problems WITH
vibrations. The guy in a shop that build my new driveshafts for after
the conversion told me that (and showed me).
According to him u-joints are supposed to operate between certain
angles, but (according to him) it is really important that the front and
rear ujoints have the same angle. He told me that the vibrations are
caused by [1] driveline angles that are too big. [2] teh difference in
driveline angle between the rear and front should be 180 degrees so that
vibrations can cancle each other out.
Also ... get real good u-joints.
I listened to his advice and my just over 1ft rear driveshaft that has a
pretty steep "angle" never caused any notible vibrations etc with my 4"
lift.
As for the front driveshaft, yes the angles are mismatched there, but
within the specs of the ujoints (rear driveshaft got real short, front
driveshaft got real long) besides I almost never drive "fast" in 4wd anyway.
Ron
btw: a CJ7 is about 12" longer, so you should be able to get rid of
that vibration.
Bob wrote:
> BTW, I would have loved to see what that looked like, you driving
> around with your front end lifted 4" and your rear at stock height.
> Must've been an amusing site. Not to mention interesting to drive...
> ;-)
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message news:<c0f6ea$166d50$1@ID-193866.news.uni-berlin.de>...
>
>>First I put the lift kit (4" superlift kit) on the front end of my 83 CJ7
>>and drove it till the next weekend when I put the rear half on. Everything
>>was fine with only the front on. Now, with the rear on I get a vibration
>>from the drive shaft it seems at around 40 and up. The when I let off the
>>gas I hear a noise like a 10 speed bike would make when you are coasting
>>only heavier, click click click click.... etc.
>>
>>The kit came with a transfer case drop kit but I didn't install it. Others
>>I have talked to said they didn't use the transfer case drop kit.
>>
>>Has anyone else had this problem or can anyone give a comment or help?
>>
>>Thanks,
