Pinion Angle On A 1969 Corvette

DorianL

solid fixture here in the forum
Staff member
I have suspected for a little while that there might be an issue with my driveline and that is has to do with the alignment of my driveline. I get a vibration as of 55 MPH.

From what I read, the trans should be angled down 2 degrees. Ideally the pinion should be angled up two degrees. However, I also understand that, from factory, C3 corvette pinion angles were at about 0.

I will have to recheck my measurements tomorrow, but I think my trans is spot on pointing down at 2 degrees. The pinion also seems to be pointing down and close to 4 degrees... I will have to recheck it.

So the pinion needs to be raised 4 to 6 degrees.

As I understand it (after reading tons of articles) to raise the pinion, you need to trim the snubber/doughnut bushing and or shim the rear crossmember.
Correct ?

I suspect trimming the snubber will not be enough. I will have to shim the crossmember. Hopefully that won't be as aggravating as it sounds...
 
I want to see what you think after replacing the bushing in the tailshaft of the trans, then
go from there.
 
I want to see what you think after replacing the bushing in the tailshaft of the trans, then
go from there.

Yep - I think that's what I'll do.

I got some rest an measured again as carefully as I could ...several times. This time, with Tremec App confirming, I am in the green. :D

Maybe I can find an excuse, that cops will buy, to take it out for a short drive tomorrow.:confused:

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