You never want the rearend setup with positive pinion angle. Place angle finder on bottom of driveshaft and write down the reading.
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Setting pinion angle 4 link. Part 2 in our series of tutorial videos that explain drag racing 4 link rear suspension set up shows you how to set pinion angle. To start viewing messages select the forum that you want to visit from the selection below. What is the most accurate method for setting pinion angle on a 4 link rear. Part 3 pre load. Set the angle finder on the face of the yoke where the u bolts go through. Part 4 anti roll bar.
Click the register link above to proceed. A ladder bar or 4 link setup is much more rigid and therefore usually only needs 1 3 degrees. You may have to register before you can post. This is when the yoke of the rearend is tilted upward more than the driveshaft. If the vehicle is equipped with leaf springs then you can use wedge shaped aluminum shims to move the pinion up or down. The typical leaf spring rear suspension will need 5 7 degrees of negative angle.
Part 2 pinion angle. Rotate the pinion so that the ujoint caps on the yoke are pointing up and down. Part 1 rear end alignment. A properly designed 4 link will have minimal pinion angle change over the stroke of the suspension. You want the pinion angle set equal to but opposite of the enginetrans. According to bickel a ladder bar suspension normally requires degree of pinion angle a four link requires 1 2 degrees and a leaf spring suspension requires up to 6 to 7 degrees.
Also look to make sure the transmission mount itself has not collapsed as this could cause a change in angle as well. Part 5 ride height. Basically you want 3 5 down on the engine and trans 3 5 up on the rear. Be sure to check out all of the other videos in the series. If you are running a 4 link suspension system you can adjust the upper rear end links in or out to bring the variation back into where it needs to be. If this is your first visit be sure to check out the faq by clicking the link above.
Just think of it like one cancels out the other and youll remember it then. On a triangulated four link factory gm or ford the upper bars are also used to set the pinion angle by adjusting both uppers the same direction and same amount.
Gallery of Setting Pinion Angle 4 Link
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