It seems ever since I installed the 4.56 yrs ago I've had a driveline vibration. With my old 383/700r4 and driveshaft it was always bad around 65-70mph.

Now I have the 6.0/4l80e and brand new shaft it still vibrates. It even has a new 1350series pinion yoke.

I havent ck'd the degree of angle yet but the trans is pointing down and the driveshaft is pointing down from the rear end to the trans

I'll have to look at the rearend but I believe it is pointed up.

Does anyone know how to adjust the pinion angle with a DJM 4/6 drop??

I do have a KentMoore Inclinometer and I have an angle finder so it should not be a problem.