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JR
UPPER BALL JOINT
DESCRIPTION
The ball joint is pressed into the upper control arm
and has a tapered stud for attachment to the steer-
ing knuckle. The ball joint stud is attached and
locked into the steering knuckle using a special nut.
The ball joint is a sealed-for-life type and requires no
maintenance.
DIAGNOSIS AND TESTING - UPPER BALL
JOINT
(1) Raise and support vehicle so that tires clear
floor. (Refer to LUBRICATION & MAINTENANCE/
HOISTING - STANDARD PROCEDURE)
(2) Push inward and pull outward at top of tire
noting if any movement of ball joint occurs.
(3) If movement is noted, replace upper control
arm.
ALTERNATE METHOD
(1) Raise and support vehicle. (Refer to LUBRICA-
TION & MAINTENANCE/HOISTING - STANDARD
PROCEDURE)
(2) Remove tire and wheel assembly. (Refer to 22 -
TIRES/WHEELS - REMOVAL)
(3) Push inward and pull outward on neck of
knuckle near ball joint while observing ball joint for
movement. Holding a finger against knuckle and
upper control arm while performing this helps to
sense movement.
(4) If movement is noted, replace upper control
arm.
UPPER CONTROL ARM
DESCRIPTION
An upper control arm is attached to the top of each
rear knuckle, connecting the knuckle to the rear sus-
pension crossmember.
The attachment of the upper control arm to the
knuckle is achieved through a ball joint in the upper
control arm. The upper control arm is bolted to the
rear suspension crossmember using a pivot bar which
is rubber isolated from the upper control arm.
OPERATION
The upper control arm supports the upper end of the
knuckle and allows for the up and down movement of
the suspension under jounce and rebound travel.
REMOVAL
NOTE: The rear control arm, control arm bushings,
and pivot bar are serviced as a complete assembly
on this vehicle. Do not attempt to disassemble the
control arm from the pivot bar to service the rear
control arm bushings.
(1) Raise vehicle. (Refer to LUBRICATION &
MAINTENANCE/HOISTING - STANDARD PROCE-
DURE).
(2) Remove both rear wheel and tire assemblies
from the vehicle.
(3) Remove the shock absorber clevis bracket to
rear knuckle attaching bolt and nut (Fig. 29) on both
sides of the vehicle.
Fig. 29 Shock Absorber To Knuckle Attaching
1 - ATTACHING BOLT
2 - REAR KNUCKLE
3 - SHOCK ABSORBER CLEVIS BRACKET
4 - LATERAL LINK
(4) Remove muffler support bracket from rear
frame rail (Fig. 30).
Fig. 30 Muffler Support Bracket
1 - REAR FASCIA
2 - MUFFLER SUPPORT BRACKET
3 - ATTACHING BOLTS
4 - MUFFLER
REAR SUSPENSION
2 - 47
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