Is it necessary for me to change my pinion angle when I install my new BudBuilt 1" drivetrain lift crossmember? If so, then what degree shims do I need. I checked 4Crawler's site and saw that he has the shims available. Bud told me that the 1" DT lift wasn't a problem on my truck because pinion angle is easily adjusted. I'm guessing there's probably a cool mathematical forumula I could apply or maybe a real big protractor. What do you think?

Edit: Oops, please excuse me while I go read Roger's site a little more carefully! He's got a FAQ section I didn't see at first. Hmmm . . . . do I need to worry about the front pinion angle too?

 

I would link you proablly dont have to worry about it, but if you do its just a small shim under the rear leavel. If you have the stock shock setup you should be able to go up to 6 degrees, but I doubt you need more than 2 if any.

As for the front, your still running IFS right, I wouldnt worry about..

 

Thanks nala! Yep, still IFS in front. So, 2 if any in the rear. Cool!

 

Depends on what sort of shaft you have. If u-joints on each end and you raise the engine and t-case equally, then no adjustment is needed. If you raise the t-case only, then might need 1-2 degrees. Best option is to check the angles before the lift and check afterwards if you find you have some high speed drive line vibration. That way you'll know how much the angle changed and thus what shim is needed to correct it:

http://www.4crawler.com/4x4/CheapTri...l#Measurements

And if you want to pre-figure the angle change (with an uneven drivetrain lift), dig out your old trig book. Simply measure the horizontal separation between the pair of motor mounts up front and the tranny mount in the rear. Then just divide that into the lift height difference (end to end) and take the inverse tangent (arctan) of that ratio. At about 44" more or less between those points, you get about 1 degree angle change per inch of uneven lift. As far as the front angle change, not a lot you can do about that on IFS since the diff bolts to the frame. Only issue would be some vibration during high speed 4WD operation.