My TJ has a ~3" 4WDH lift. Currently the rear OEM LCA's are used. When I
first got the Jeep (lift already installed by PO), there was slight
vibration (hard top on at this time). This past summer when I put the soft
top and half doors on the vibration went away. Now that the weather is cold
the hard top and vibration are back. So I am thinking the weight of the
hard top changes the rear suspension causing the vibration. My answer is to
put a set of adjustable LCA's on to compensate for the weight of the hard
top. How do I adjust the new LCA's, longer, I think? How much
longer/shorter? The instructions say adjust to 16.5" (the OEM's measure
about 16"), but don't mention anything about the size/amount of lift.

Next question: the instructions say remove the lower shock mount, lower sway
bar mount and coil spring? Why the spring?

--
JimG
80' CJ-7 258 CID, HEI
4.56 Gears, Lock-Right F&R
35" BFG MT on 15x10 Centerlines
D44 Rear, D30 Front. SOA
Dana 300 w/4:1 & Currie twin sticks
Warn X8000i w/ dual batteries

00' TJ Sport 4.0L, 5sp
4.56 Gears, TrueTrac rear
33" BFG AT on 15x8 Eagle Alloys
D35 Rear, D30 Front. 3" Suspension Lift
Warn X8000i

 

I'd think it's similar to when I put on my upper adjustable control arms...
I put them on when the TJ was supported on the frame with jackstands,
although I've been told it's possible to put them on while the jeep is still
on the ground. I guessed what length they should have been, and was off a
bit so I had to adjust them while it was on the ground.

If you have the sye kit and cv driveshaft then the pinion should be pointing
at the output shaft of the transfer case, I was chasing down driveline vibes
and when I finally did this it worked. Also someone (sorry can't remember
who) in this group suggested a jack under the rear pumpkin to kinda push it
up to where it needs to be. I had to have my brother help a little bit, cuz
the angle of the differential would let the jack slide off. I cut a wedge
of wood to help with that though.

I learned a bit about angles from here:
http://www.4x4wire.com/toyota/tech/driveline/

Hope this helps

Troy

 

I'd think it's similar to when I put on my upper adjustable control arms...
I put them on when the TJ was supported on the frame with jackstands,
although I've been told it's possible to put them on while the jeep is still
on the ground. I guessed what length they should have been, and was off a
bit so I had to adjust them while it was on the ground.

If you have the sye kit and cv driveshaft then the pinion should be pointing
at the output shaft of the transfer case, I was chasing down driveline vibes
and when I finally did this it worked. Also someone (sorry can't remember
who) in this group suggested a jack under the rear pumpkin to kinda push it
up to where it needs to be. I had to have my brother help a little bit, cuz
the angle of the differential would let the jack slide off. I cut a wedge
of wood to help with that though.

I learned a bit about angles from here:
http://www.4x4wire.com/toyota/tech/driveline/

Hope this helps

Troy

 

I'd think it's similar to when I put on my upper adjustable control arms...
I put them on when the TJ was supported on the frame with jackstands,
although I've been told it's possible to put them on while the jeep is still
on the ground. I guessed what length they should have been, and was off a
bit so I had to adjust them while it was on the ground.

If you have the sye kit and cv driveshaft then the pinion should be pointing
at the output shaft of the transfer case, I was chasing down driveline vibes
and when I finally did this it worked. Also someone (sorry can't remember
who) in this group suggested a jack under the rear pumpkin to kinda push it
up to where it needs to be. I had to have my brother help a little bit, cuz
the angle of the differential would let the jack slide off. I cut a wedge
of wood to help with that though.

I learned a bit about angles from here:
http://www.4x4wire.com/toyota/tech/driveline/

Hope this helps

Troy