Can someone tell me what the distance from hole to hole is on an upper rear control arm please(64-67 A-Body)?Mine are adjustible and i think the jam nuts loosened and i`m trying to put it back to where its suppost to be. Thanks
I don't know the answer to your question but I do feel that the best way to set them at this point would be to set them to get the optimum pinion angle.
That is the correct answer to the question. I set my pinion 2 degrees down from parallel to the transmission output angle. Example: With the car on a drive-on rack with weight on all the tires, my trans angled downward 3 degrees toward the rear axle. The pinion angled upward at 1 degree toward the trans. Under power these two angles would be parallel; 3 down for the trans and 3 up for the pinion. The pressure on the bushings and braces while driving will raise the nose of the pinion upward, especially at full power, and they should then be about parallel. All performance vehicles should be checked for pinion angle, and also have frame braces on the front bolts of the control arms: tying the uppers to the lowers.
ok i will try to check my pinion angle but i dont have a rack maybe i can take it to a shop,what is ideal for angle for trans and pinion? Thanks
I would say 2 degrees on a four link GM A body for street/strip. A stick shift car MUST HAVE the braces I referred to, or your upper control arms may pull the crossmember out of shape or tear it. My friend destroyed his Tempest crossmember with a big block and a stick shift.
After you set the angle; The car will pull to the left or right. Adjust the right upper arm only. Do not touch the left upper arm as it holds the pinion angle at all times. If the car tries to go left on launch, lengthen the upper right arm one or two flats. Pulls to the right; shorten the right arm one or two flats. One flat can make a difference.
