how do i fix this???????

[morcav]

I have a vibration when driving down the road, mainly when I am starting to press on the accelerator or letting off, I'm thinkn that it is my driveline or pinion angle, and if your answer is shims then how do I know what degree shims to order? I appreciate any help/info


91 K5, 4" lift w/blocks inthe back and 35" m/t's

 

[88sub4x4]

Also check that your U-Joints are good.
To check angles, you need to measure the angle of the yoke coming out of the case, and the angle of the pinion. Thease measurements are taken in reference to level ground. You want the two to be at less then a 5* difference

 

[morcav]

what all would I have to do to drop the t-case?