POWERTRAX Grip Pro - Important Application Note; Important Lubrication Note; Special Notes; Vehicle Specific Notes

GRIP PRO INSTALLATION MANUAL
3
IMPORTANT APPLICATION NOTE
Before installing the ring gear
and pressing the bearings on to the
dierential, the following two (2) items
need to be checked:
1. Ensure that your axle shaft
mates with the dierential side gear.
Some models have dierent spline
counts depending on the year of
manufacture.
2. Check the dierential ange
position (bearing shoulder to ange
face) to ensure that it is correct. You
may compare it to your old one. The
dierential ange position depends
only on the gear ratio that you are
using. This ange position may
change at certain gear ratios. Some
aftermarket ring gear and pinion sets
specify the dierential case “series”
that is required.
If you feel that you have the wrong
dierential for your application,
contact your place of purchase and
make the necessary arrangements
to exchange the dierential for the
correct one.
Once the dierential has had bearings
and/or a ring gear installed, it can
no longer be considered new and
therefore cannot be exchanged for a
new one.
IMPORTANT LUBRICANT NOTE
The Powertrax® Grip Pro™ limited-
slip dierential design uses helical
cut gears to transfer power to the
wheel with the most traction. Always
use an 80W-90 mineral/petroleum
based gear oil with at least a GL-5
rating. Synthetic oil and oils that
contain friction modiers are NOT
recommended.
SPECIAL NOTES
All Powertrax® Grip Pro™ limited slip
carriers require a certain amount of
resistance with the ground to start
to the power transfer. A Grip Pro
dierential will not transfer power if
the spinning wheel is o the ground.
In this situation a light application
of the brakes will generate enough
resistance to transfer the power to the
other wheel.
• Powertrax Grip Pro carriers can’t be
interchanged between the front and
rear dierential.
• Chrysler® 8.75” Part# GT308730
applications require the use of sealed
non-adjustable wheel bearings and
the following carrier bearings:
LM104949 Cone
LM104912 Cup
• Dana® 35 Part# GT443527
applications might require the pinion
gear to be modied to clearance the
carrier case.
• Ford® 8” Part# GT108028
applications might require the pilot
bearing area to be modied to
clearance the carrier case. GT108028
requires the use of open type ring
gear bolts part# D8OZ4216B and the
following carrier bearings:
LM102949 Cone
LM102910 Cup
• Ford® 8.8” Part# GT108831 contains
2 axle spacers. The shorter spacer is
used for 1983-’86 models & the taller
spacer is used for 1987-’14 models.