Originally Posted by swapmeet

Hello, I've tried searching in a variety of ways and can't find an answer. So hopefully this isn't a wasted new post.

Decelerating/ braking creates a vibration in the Driveshaft or U-joint. My truck is a 07 4x4 V8 lifted 3.5+" on Radflo 2.5 shocks, which are very soft. Because of the softness, I get a lot of nose dive when braking, so I think it exacerbates the issue.
I've always had a minor vibration when accelerating hard, and still do. This feels similar, but much more exaggerated.

My thought is that its either pinion angle or the slip yolk. I remember people saying it helped to get a driveshaft spacer if you lifted your truck because of the slip yolk. Is this still a thing?

I'm looking at adjustable arms for the rear, but I don't want to pull the trigger until i'm sure it'll resolve my problem.

In case anyone feels compelled to ask, its not the brakes. 100% sure.

Thanks