Vibration over 40 mph.

89on35s said

Ok. I should have never even used the Tremec App because I really didn't understand what it was telling me anyway. Here are my u joint angle measurements as I just measured them.
View attachment 1715172116
I took the driveshaft off to measure the diff end and the trans end. Ignore the 3.2 number. It measures 4 deg. down at the pinion after I added my 2 deg. Shim. Where do I go from here?
Cley

Click to expand...

The trans and pinion angles should be about the same.
I know people say you should make the pinion angle compensate for being loaded, but in a driver car there just isn't enough load to change it much in normal driving.

Your Ujoint crosses are in line with each other, right?

You can also try swapping your front yoke 180, as it CAN make a difference if it was originally assembled and balanced one way and someone changed the ujoint without putting the yoke back the same way.
They were originally built and balance with the yoke in that ONE position, and putting one back on 180 off from that can and will cause balance issue's.