GRIP PRO INSTALLATION MANUAL
4
• Ford® 9” Part# GT109028 and
GT109031 applications might
require the pilot bearing area to be
modified to clearance the carrier case.
GT109028 and GT109031 requires
the use of open style ring gear bolts
part# D8OZ4216B and the following
carrier bearings depending on size of
3rd member:
2.891” 3rd member:
LM102949 Cone
LM102910 Cup
3.0625” 3rd member:
LM603049 Cone
LM603011 Cup
• Ford® 9” Part# GT109035 and
GT109035-45 applications might
require the pilot bearing area to be
modified to clearance the carrier case.
GT109035 and GT109035-45 require
the use of open type ring gear bolts
part# D8OZ4216B and the following
carrier bearings:
3.2500” 3rd member:
LM104949 Cone
LM104911 Cup
• GM® 8.5” Part# GT201030 1988-’98
applications require the use of the
following carrier bearings:
LM102949 Cone
LM102911 Cup
INTRODUCTION
Ring and pinion backlash and
differential carrier bearing preload are
two items of concern when installing a
differential.
These items are typically adjusted by
means of shims or threaded adjusters.
The shims or adjusters will determine
the position of the ring gear, which
determines the backlash of the ring
and pinion set. When installing a
differential, the backlash should be
set to the original backlash setting,
measured prior to disassembly. To
increase the backlash, adjust the
shim packs or threaded adjusters to
move the ring gear further away from
the drive pinion gear. To decrease
backlash, move the ring gear closer to
the drive pinion gear.
Bearing preload refers to the
amount of interference (press) fit of
the differential case and bearings
into the carrier housing. Adjust
the bearing preload by adding or
removing shim pack thickness or by
tightening or loosening the threaded
adjusters. Too much bearing preload
will cause premature bearing failure.
Insufficient bearing preload will allow
the differential to ‘walk’ in the housing
causing damage to the ring and pinion
set and other components.
These instructions are intended as
an aid for the experienced automobile
mechanic in properly installing the
limited-slip differential. It is expected
that the installer be equipped with
the proper tools, equipment, and
experience before attempting the
installation.
It’s a good idea to have an extensive
selection of shims or adjustable shim
packs on hand to properly install
the differential. Threaded adjuster
applications do not require shims.
