Southside Machine Performance Adjustable Upper Control Arms
Note: Check your pinion angle before you start, so that you know which way to adjust the new arms. But beware that if the upper and lower control arm bushings are worn out, the axle may shift when the car is driven, making your measurements less accurate.
1. Raise the vehicle and place it on jack stands with the rear axle hanging. (no weight on the rear
axle.) Place a jack under the differential housing and support it lightly.
2. Unbolt and remove one upper rear control arm using a ¾” wrench. Remove only one control arm at a time. This will make it easier to line up the new control arms when they are installed.
3. Adjust the length of the control arms as needed to achieve the desired pinion angle. 3 to 4 degrees nose-down is recommended. Shorten the arms for more nose-down pinion angle. Lengthen the arms to bring the pinion angle up. 1/8 inch adjustment will change the pinion angle approximately 1 to 2 degrees. Adjust both arms at the same time to be sure they are the same length.
SHORTENING THE CONTROL ARMS MORE THAN 1/2" FROM STOCK CAN CREATE
NOISE, VIBRATION AND HANDLING PROBLEMS.
FAILURE TO HEED THESE WARNINGS MAY LEAD TO SERIOUS INJURY.
4. Tighten the jam nuts on the control arms. Loctite thread locking compound is recommended.
5. Grease the sides of the bushings and the thrust washer with a synthetic grease and install the front end of the control arm into the car. Do not tighten the bolt yet.
6. Pull the control arm down over the axle bushing and install the bolt. Raise or lower the front of the differential with a jack to align the boltholes. In some cases it may be necessary to jack under the rear of the differential (under the cover) to tilt the bushings forward.
6. Tighten both bolts and repeat the procedure for the other arm.
7. Check the pinion angle using the Chassis tuning tips link. Because of production variances and the large variety of modified cars, some re-adjustment may be necessary.
Southside Machine Performance Lower Control Arms
To aid in the installation of our rear suspension products, mark the rear shock absorbers
(with a marker) just below the protective skirt. This will be used as a reference later.
Place the transmission in neutral and hoist the vehicle into position. While the vehicle is in the air support the weight of the rear axle, raising it to the marks made on the shock tubes.
1. Remove the control arm with a ¾” wrench.
2. Lube the bushing mating surfaces of the control arm with a synthetic grease.
3. The factory control arm length should be duplicated if using an adjustable lower control arm. To accomplish this place your new control arm
on top of the factory one and align bolt holes.
4. Repeat steps 1-3 for the control arm installation of the second control arm.
5. Instal arm in reverse order.
6. Reinstall the wheels lower the vehicle and road test.
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