rear end removal thread- LS1GTO.com Forums
swapping the gears-
LS1GTO.com Forums - 3.91 Gear Install...GHETTO Style
Thank you Kurt from Diff Technics for the following:
IF the 3.46 ratio pinion that you take out of the diff has lets say a marking
of 0 and then the 3.91s we sent you have a 2 marked on them this would mean
that the 3.91 pinion is .002 further into mesh with the ring gear than the 3.46
so you must remove .002 from the pinion location shim if it was the other way
round and the 3.91 pinion had a -2 (negative two) on it this would mean that the
pinion is .002 out of mesh with the ring gear center line, So hence you must
ADD .002 to the shim size and if you were luck enough to have 0 put it straight
in !!! I hope this helps you out on the location side of things !
Now as for the back lash .004 to .006 back lash is a must no more no less on
these ring and pinions !
These are the stock (dana) specs for the LSD
1. Pinion Gear Bearing Pre-load 25-35 In Lbs (1.32-1.54 ft lbs), Add 8-12 In Lbs
If The Seal Is Installed. Light Machine Oil Only, No Gear Oil For Pre-load.
2. The Torque Spec On The Crush Sleeve Is In The 150-500 Ft Lb Range With 230ft
lbs The Usual Number Needed To Get You Close.
3. The Side Cap Carrier Bearing Pre-load Is 41-51 Ft Lbs With Final Adjustment
(load) Preferred Towards Pinion Gear. Light Machine Oil Only, No Gear Oil. Turn
the carrier approx 20 times or so, re-check the torque spec.
4. Backlash is 4-7 thousands with tooth pattern preferred over tightness. He
indicated a center to lower (towards small side of ring gear) contact preferred.
this should keep it quiet.
All Seals Should Be Greased With A High Quality Grease (i Prefer Moly on seals
and never used anything else) To Keep The Seals From Burning Out Prior To
Seating Up To The Metal Parts They Are Meant To Seal. Do Not Install Them Dry.
1) AXLE ASSY
3) INNER CV JOINT
4) OUTER CV JOINT
7) CARRIER COVER
8) AXLE SHAFTS
9) AXLE SEALS
10) DIFFERENTIAL CASE
11) SIDE BEARINGS
12) GEAR KIT
13) RING and PINION
14) REAR PINION BEARING
15) PINION SPACER
16) FRONT PINION BEARING
17) PINION SEAL
18) COMPANION FLANGE