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The Leader gears were a wonderful contribution to the Z32
community. I had them on my first TT. The secret is: setting
up a diff. is an iterative process. After the diff leaves the bench,
it must me installed-driven-listened-to over a short distance.
If there is any noticeable gear whine on acceleration or de-accel,
the car has to go back on the lift, the diff. pulled (again), the diff
broken down, re-shimmed, put back together, re-installed in the car,
and the car driven again. If you want a quiet-as-possible diff,
you may have to do this 2,3,4,5 times. Most shops will lose patience
with you after 2 times...leaving you to have to go to another
shop and play like its the first time. This can be
extraordinarily expensive...and if you do it yourself,
very time consuming. The reason factory diffs don't
usually make noise is two-fold: 1) All new parts at the
time of setup and 2) Million dollar machines doing the setup.
Remember, when you put new parts in an old diff, the tolerances
are going to vary. This makes the job difficult to get right
the first, second, or even third time. People do win the lottery,
so it is possible that the bench setup would be right-on the first
time by sheer luck....but more likely its going to be
trial and error. This is not the fault of the new ring
and pinion...its just the process that you have to go
through because most shops are doing the job
with simple tools and won't know if they have a quiet
setup till the car is driven under load. I had my diff.
adjusted 3 times and got a setup that was nearly as
quiet as the OEM stock diff. New diff. bushings help too.
You can't establish a wear pattern during testing...just
drive far enough to listen to the diff.
Sorry if you got a nickel's worth instead of 2 cents.
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