what's up guys!! I am in the process of baggin my 88 R30 crew cab(square). I have the old rearend out and replacing it with a c&c rear. I have the axle jack up to the bottom of the stock frame( before I cut it out for the notch) to make my 2 link bars. my question is, what do I need to set the pinion angle at? I was thinking like -3 degrees so when the axle comes down it will be at the right angle to drive without vibration. any help would be appreciated. Brad in SC
With the 2 link you should set the pinion angle at ride height, it will change. Here is something I found that should tell you how to set it. I know there are better descriptions out there but I can't find them right now and don't have much time.
Angle setup for two-piece shafts is similar to the one-piece. All three working angles should add up to zero. The easiest way to do this is to mount the front shaft section so it has zero degrees through the joint at the transmission. The rear shaft may then be treated as if it were a single shaft. Sometimes this is not possible and all three angles must be juggled to arrive at zero. It is a good idea to allow for some up and down adjustment at the center support mount so the angles may be tuned as necessary once the car is driven. Vehicles that do not have the proper angles set in the driveline components will experience pulsations that will cause vibration in seats, mirrors, gearshift levers, and other miscellaneous parts. These pulsations can also destroy transmission clutch packs, tailshaft housings, rearend bearings, gear sets, and axles. Another concern in this area is a compound angle that comes about if the centerline of the differential is not in direct line with the centerline of the engine and transmission. Luckily most rodders are visual conscious when setting up the rearend and use housings with the pumpkin centered perfectly in the center of the vehicle. Pay equal attention to avoid any compound angles while setting up the engine/trans relationship to the rearend. Setting up the components right from the beginning can save a lot of frustration and costly repairs down the road.