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GMC ZE06581 1976 Maintenance Manual Supplement page 39

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3A- 2 0 FRONT SUSPENSION
Figure 22-Location for Front Ride Height Adjustment
1 . Install Tool J-22517-02 with pin of tool
aligned into hole in crossmember. 'Seat center
screw in dimple of torsion bar adjusting arm .
2. If vehicle must be raised, turn tool until
proper adjustment level is reached, then turn
the adjusting bolt until it makes contact with
the adjusting arm. Remove tool .
3 . If
vehicle
is
to
be ' lowered,
raise
adjusting arm from
contact with adjusting
bolt .
Lower bolt, then lower arm with tool
until proper ride height level is reached . Raise
bolt to contact adjustment arm. Remove tool .
FRONT END ALIGNMENT
Check
Set
Caster . . . . .
+1-1/2 0 to
+ 2-1/2 0
+
20
Camber-L .H . .
.
+ 1/2 0 to 1
0
+
3/40
Camber-R .H . . . + 1/4 0 to 3/4 0
+
1/20
Toe
. . . . . .
0 to -1/4"
-1/8"
(toe out)
(toe out)
Make adjustments as .required .
Refer to
"ALIGNMENT ADJUSTMENT" below.
ALIGNMENT ADJUSTMENT
Camber
1. Loosen nuts on inboard side of upper
control arm cam bolts. (figure 1).
2 . Turn front cam bolt (inboard or outboard)
to correct for 1/2 of incorrect setting found in
checking .
3. Turn rear cam bolt (same way front bolt
was turned) to correct for remaining 1/2 of
incorrect setting found in checking .
Example:
Camber Reading (Checking) . . . . . . . . . . + 1-1/40
Amount To Be Corrected. . . . . . . . . . . . . . 1/20
1/2 of 1/20 = 1/4 0 Front Cam Bolt
Remaining 1/40 Rear Cam Bolt
4. Tighten upper
control
arm cam nuts
(front and rear) . Torque to Specifications while
holding bolts with back-up wrench so that
camber is not changed .
See Specifications
listed at the end of this section . Check caster;
do not reset unless caster exceeds specifi-
cations .
NOTE :
Check cam adjustment surface for
weld splatter . Weld splatter in this area will
affect front end alignment .
Remove weld
splatter if found .
Caster
l . Loosen front and rear cam nuts while
holding bolts with back-up wrench so that
camber is not changed .
2 . Turn
front cam bolt so that camber
changes 1/4 of the desired amount of caster to
be corrected .
Example :
Caster Reading (Checking) . . . . . . . . . . . . . . . . . . . . +50
Amount To Be Corrected. . . . . . . . . . . . . . . . . . . . . . . . 30
1/4 of 30 = 3/4 0 Front Cam Bolt
3 . Turn rear cam bolt so that camber now
returns to corrected setting .
4 . Recheck caster setting.
This is a location to start from and a correct
setting can be obtained with the above pro-
cedure .
NOTE: Torque upper control arm cam nuts
to Specifications listed at the end of this
section .
Hold head of bolt securely ; any
movement of the cam will effect the final
setting and caster-camber adjustment must
be rechecked .
Toe-In Adjustment
1 . Loosen the clamp bolts at each end of
the steering tie rod adjustable sleeves. Tie rod
assembly must be decreased in length in order
to increase toe-in.

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