1972 Burb Guy dropping in!

[HO455]

Originally Posted by SCC2560

Attachment 1885029

But currently I'm having trouble with my drive line set up. Got the two piece drive line and can't stop it from vibrating. Not sure if I have the angles right. Got all new U-joints and slip yoke but still shaking around 65 mph. Now am I supposed to add up the angles from both the trans shaft and the first u joint to equal the angle of the diff??? or zero out the first shaft and get all my angle from the second? Any help on this would be awesome!!!

Good looking Burban you have there!
There is no easy way for me to describe how your angles need to be. There are a lot of good posts here on the forum (4x4 and suspension sections). Do a search plus there are videos out there for commercial trucks which commonly come with two piece drive shafts. Things to remember are adjusting the front angle will cause a change in the rear. Raising or lowering the engine or transmission changes the front angle. The pinion angle can be adjusted with shims under the axle pads.

This site helped me with mine.

https://spicerparts.com/calculators/...gle-calculator

In addition the condition of your carrier bearing can also add to vibration issues. The shaft is supposed to be somewhat movable in a stock setup but not loose.
Being that you have a C20 you should have a two piece rear drive shaft. (Which is good if you want to go to an aftermarket billet style carrier bearing like I did.) The slip joint in the rear shaft could be worn and causing vibration too. Depending on how many miles are on your truck's driveshaft you may want to drop it off at a drive line shop and have it checked for wear and balance. They might find it has lost a balance weight or it is out of phase. Having a known good shaft makes it easier to locate the source of the remaining vibration.

Good luck!

Here is some information I posted on my Burban and setting up the angles. Post 348 and I think the original installation of the new driveshaft is two pages earlier.

http://67-72chevytrucks.com/vboard/s...698377&page=14