C1 Driveline Angles

[Bob Simard]

My 60 is not level, but is sitting on the suspension. The angle of the engine crank centerline is 4 degreesfrom horizontal, the driveshaft angle is 9.5 degrees, and the rear end angle is 4.5 degrees. This yields a 5.5 degree difference between the engine and driveshaft, and 5 degrees between the driveshaft and diff. Is this within spec or should the diff angle be adjusted? Thanks

[Greg S.]

Re: C1 Driveline Angles

Curious how you measured the crank angle? I have a magnetic protractor to make the measurements. I have a 62 currently on jack stands that I would like to measure as you have done. I installed some shims this winter under the crossmember to hopefully eliminate some vibration.

[Larry Kelly]

Re: C1 Driveline Angles

I am looking at this with my C3 rebuild right now. I don't have an answer for you but I did find this site last night that seems to have a lot of good information:

http://www.drivetrain.com/driveline_angle_problem.html

[John H.]

Re: C1 Driveline Angles

Bob -

Sounds typical of C1's I've worked on; C1 U-joints ran on the ragged edge of what's considered "normal" operating angles (which is why they used a 4-1/2"-long front yoke instead of the 3" yoke used on passenger cars). If you encounter a driveline vibration, shim the trans crossmember down from the frame.

[Bob Simard]

C1 Driveline Angles

I have the vette on ramps and jackstands so it is easy to get under to measure. I cheated on the crank angle and assumed that the crank centerline is parallel to the top of the valve covers. I was curious so I took some measurements. I have no noticeable driveline vibrations, just thought I would measure this since the engine and trans are coming out. Thanks for the replies.