True, but changing the R&P in the rear will still require resetting the
gears and maybe even the install kit. The front would require a new carrier
and R&P. Is the front donor also available from the same source you got the
rear?

"Richard J Kinch" wrote in message...
> JimG writes:
>
>> I would have went the other way... change the front to 3.76... better
>> gearing and a limited slip in the rear!
>
> That's still an option, but would require buying another gear set (or even
> the whole case?) and install kit.

 

True, but changing the R&P in the rear will still require resetting the
gears and maybe even the install kit. The front would require a new carrier
and R&P. Is the front donor also available from the same source you got the
rear?

"Richard J Kinch" wrote in message...
> JimG writes:
>
>> I would have went the other way... change the front to 3.76... better
>> gearing and a limited slip in the rear!
>
> That's still an option, but would require buying another gear set (or even
> the whole case?) and install kit.

 

JimG writes:

> Is the front donor also available from the same source you got the
> rear?

It was when I bought the rear, but it stupidly didn't occur to me that I
would need it to match the ratios, and now it was sold to someone else.

 

JimG writes:

> Is the front donor also available from the same source you got the
> rear?

It was when I bought the rear, but it stupidly didn't occur to me that I
would need it to match the ratios, and now it was sold to someone else.

 

JimG writes:

> Is the front donor also available from the same source you got the
> rear?

It was when I bought the rear, but it stupidly didn't occur to me that I
would need it to match the ratios, and now it was sold to someone else.

 

3.73 is one of the "good" ratios. Almost as good as 4.10, which is the
"best" stock ratio you can get. My advice is to drive the vehicle some, to
see how you like the new gear ratio.

As far as swapping the ring and pinion, it is doable, but setting the pinion
depth, pinion bearing preload, ring gear backlash and carrier bearing
preload are rightly considered "expert" tasks. If you don't do it right,
noises and reduced part life. If you do decide to keep the 3.73, then you
will need a 3.73 ring and pinion, a different carrier and probably an
install kit. The "carrier" is the part with the spider gears inside.

Earle

"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns9898A6EFEEA66someconundrum@216.196.97.131. ..
> Richard J Kinch writes:
>
> > The donor axle was unfortunately configured for a 3.76 ratio
>
> Oops, that should be, "3.73".



--
Posted via a free Usenet account from http://www.teranews.com

 

3.73 is one of the "good" ratios. Almost as good as 4.10, which is the
"best" stock ratio you can get. My advice is to drive the vehicle some, to
see how you like the new gear ratio.

As far as swapping the ring and pinion, it is doable, but setting the pinion
depth, pinion bearing preload, ring gear backlash and carrier bearing
preload are rightly considered "expert" tasks. If you don't do it right,
noises and reduced part life. If you do decide to keep the 3.73, then you
will need a 3.73 ring and pinion, a different carrier and probably an
install kit. The "carrier" is the part with the spider gears inside.

Earle

"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns9898A6EFEEA66someconundrum@216.196.97.131. ..
> Richard J Kinch writes:
>
> > The donor axle was unfortunately configured for a 3.76 ratio
>
> Oops, that should be, "3.73".



--
Posted via a free Usenet account from http://www.teranews.com

 

3.73 is one of the "good" ratios. Almost as good as 4.10, which is the
"best" stock ratio you can get. My advice is to drive the vehicle some, to
see how you like the new gear ratio.

As far as swapping the ring and pinion, it is doable, but setting the pinion
depth, pinion bearing preload, ring gear backlash and carrier bearing
preload are rightly considered "expert" tasks. If you don't do it right,
noises and reduced part life. If you do decide to keep the 3.73, then you
will need a 3.73 ring and pinion, a different carrier and probably an
install kit. The "carrier" is the part with the spider gears inside.

Earle

"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns9898A6EFEEA66someconundrum@216.196.97.131. ..
> Richard J Kinch writes:
>
> > The donor axle was unfortunately configured for a 3.76 ratio
>
> Oops, that should be, "3.73".



--
Posted via a free Usenet account from http://www.teranews.com

 

The 3.73 is better than the 3.07 for offroading. Why not change the front to
match the new rear?

And, you issue isn't the pumkins, it's the carriers. The pumpkin is the
outside housing of the differential, the carrier is the part that holds the
ring gear. You can swap the 3.07 carrier and ring gear into the pumpkin that
now houses the 3.73 carrier and gear.




"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns9898A3BB49EFDsomeconundrum@216.196.97.131. ..
>I swapped out a Dana 35 rear axle and differential on a 1997 TJ to repair a
> bent axle tube from a collision. The donor axle was unfortunately
> configured for a 3.76 ratio with the Trac-Lok limited slip, versus the
> original that was 3.07 with no locker. I want to change the old ring and
> pinion into the new differential case to get back to 3.07, otherwise we
> have no 4WD due to the mismatch between front and rear.
>
> My question is whether the 3.07 and 3.76 housings ("pumpkins") are the
> same, so that I can just fit all the old moving parts from the old 3.07
> assembly into the new 3.76 housing. I don't want to open up the cover on
> the new assembly if the bearing seats or something are incompatible. If I
> can just swap, what one-time items will I need, such as the crush sleeve,
> ring bolts, and/or shims?
>
> I've disassembled the old assembly, including taking out the differential
> case out of the housing with a ------er tool, per the manual.

 

The 3.73 is better than the 3.07 for offroading. Why not change the front to
match the new rear?

And, you issue isn't the pumkins, it's the carriers. The pumpkin is the
outside housing of the differential, the carrier is the part that holds the
ring gear. You can swap the 3.07 carrier and ring gear into the pumpkin that
now houses the 3.73 carrier and gear.




"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns9898A3BB49EFDsomeconundrum@216.196.97.131. ..
>I swapped out a Dana 35 rear axle and differential on a 1997 TJ to repair a
> bent axle tube from a collision. The donor axle was unfortunately
> configured for a 3.76 ratio with the Trac-Lok limited slip, versus the
> original that was 3.07 with no locker. I want to change the old ring and
> pinion into the new differential case to get back to 3.07, otherwise we
> have no 4WD due to the mismatch between front and rear.
>
> My question is whether the 3.07 and 3.76 housings ("pumpkins") are the
> same, so that I can just fit all the old moving parts from the old 3.07
> assembly into the new 3.76 housing. I don't want to open up the cover on
> the new assembly if the bearing seats or something are incompatible. If I
> can just swap, what one-time items will I need, such as the crush sleeve,
> ring bolts, and/or shims?
>
> I've disassembled the old assembly, including taking out the differential
> case out of the housing with a ------er tool, per the manual.