Owners manual

11
51088
Revised
12.1.05
and PN 90-2108) install using the OEM nuts and washers, install the passenger side differential
drop to the OEM mount as shown in ILLUSTRATION 7.
4. Hang the differential from the drivers side drop (PN 90– 3012) using the supplied 9/16” X 4”
bolt. Install the supplied torque strut (PN 90-2124) to diff. drop using 9/16” hardware as shown
in ILLUSTRATION 6. Install the supplied washer and lock nut and tighten the assembly enough
so that the strut can be moved without much effort to complete step 10.
5. Attach the differential to the passenger side diff drop bracket (PN 90-1261) as shown in IL-
LUSTRATION 7 with the OEM nuts and bolts. At this point, leave the fasteners slightly loose
until the torque strut is positioned and the main cross member is back in place. Please note: On
some models a small amount of material will have to be removed from the frame around the
passenger drop for adequate clearance. Maintain a minimum of 1/4” clearance around this
flange. SEE ILLUSTRATION 5.
6. Install the rear cross member (PN 90-1799) into the truck using the OEM bolts with heads
facing rearward to hold it in place. Carefully guide the differential mounting bushing into the
mounting flange on the new cross member. See ILLUSTRATION 10
7. Install the OEM bolt through the rear cross member and differential bushing with the threads
to the inside of the truck and install the OEM nut. Snug all differential mounting hardware to se-
cure the differential location at this time.
NOTE: It is very
important that the differ-
ential is centered in the
chassis. The best way to
accomplish this is to
measure the distance
from the C.V. flange on
the differential to the
rear lower control arm
mounting hole. Com-
pare driver side to pas-
senger side and move
differential to center.
On some models the cast
ribs on the differential
case will need to be
ground away to provide
adequate clearance be-
tween differential case
and the factory lower
control arm pocket.
⇒ Failure to center
the differential may
cause premature con-
stant velocity (C.V.) joint
wear or failure.
OEM Hardware
Front of vehicle
Illustration 9
Front Crossmember
Front Crossmember
PN 90-1807