pinion angle drama

GDay guys
Ive put bigger tyres on the roadster rolling ch***is since setting pinion angle and also taken a leaf outa the front spring. Now the diff runs slightly downhill to the auto. Will the unis get munched? Should i give a rat's.
I have the coilovers sitting in ther middle of three locating holes on the brackets so I can lift it about an inch higher at the rear andd if I put the leaf back ion it might be level - hows that?
As you can see Im building this rod under pretty exacting parameters
Steve

 

pinion angle is relative to the angle of the trans, not the ground.
unless you've changed the engine mounting, it ain't gonna make a difference

 

Pinion angle is only important in relation to gearbox output shaft angle.
Nothing you describe changes pinion angle. You can take your car and stick in the ground Cadillac Ranch style and the pinion angle is still the same.

The input speed N will after the u-joint vary between N x cos α and N/cos α twice per turn of the prop shaft.

If the angle through the first and the second U-joint is the same those two equations will cancel each outer out and the speeds will be the same.

 

What he said.

 

In english the sum of the two angles should always equal 180 degrees" use a inexpensive angle finder from sears or harbour freight etc. at ride height put one on shaft , then check the angle of the joints ie 85 degrees on one and 95 degrees on the other equal 180 degrees . or check the ujoint angle and compare to the one on the shaft it self and see how much angle there is. a small block chevy and trans with the manifold at carb mounting surface is factory built at 6 degrees down in back with the carb flange level that makes the ujoint at a 6 degrees angle as well , then you can set pinion angle with that known angle.

 

I always run the pinion angle a couple of degrees below CL with no problems. If that's where you are, you should be fine.

 

I've always been told and done the same. I guess becuase under acceleration the pinion will rotate up a little (especially on leaf sprung cars) and then be parallel to the ****** output.

 

Thanks for the input guys - Ill just forget about it for now and press on

Steve