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I'm working on getting my driveline angles correct. Below is a representation of my setup. As shown, the top numbers are relative to the ground, the bottom numbers are relative to setting the engine/output shaft at 0d egrees. These numbers can be a little confusing because it is a coincidence that the rear pinion happened to be level to the ground, so pay close attention to the arrows at the end of each number.
What has made this more confusing to me is that, although relative to the ground the driveshaft has a downward angle, relative to the output shaft the driveshaft angles up. This is not a racecar, it is a daily driver with almost stock suspension (aftermarket springs because that is all that was available). I have never encountered a situation where the pinion is above the output shaft (relative to the centerline of the output shaft, not relative to the ground). Is there any issue with the driveshaft angling up to the pinion as long as the pinion matches that angle? Obviously this wouldn't be great in a racecar because when you accelerate the pinion will rotate away from the pinion rather than towards it. If that's the case, it seems to be the solution here is to raise my pinion 2.05-2.10 degrees. Is this correct?
Thanks,
Brandon
Last edited by Vetteman61; Apr 29, 2020 at 08:58 PM.
for proper u-joint operation, rear face of trans needs to be parallel with front face of differential. This can be accomplished by angling the differential upwards or rotating the engine/transmission assembly such that the rear of the trans moves up and the front of the engine moves down.
Please note: you ujoints will not spontaneously explode. When i say "for proper operation", what i mean is primarily torsional vibration (vibration caused by the driveshaft speeding up/slowing down due to ujoint phasing), and ujoint wear/tear. Depending on your setup, torsional vibrations may be acceptable with the ujoints 2 degrees out of phase. I believe i saw in your thread that you already took your car on a long road trip. Torsional vibrations increase as driveshaft RPM increases (ie vehicle speed) - did you notice any type of shaking on the interstate?
Long story short, this calculator is what lead me to use a CV (double cardan) at the front of my driveshaft. In my case, too much torsional vibration above 60 mph. I drive 72 for 15 miles during my daily commute so it would bother me forever.
Had a similar situation on my 95 9C1. Did some checking and found the transmission mount was in need of replacement and contributing to the problem.
Replaced the mount with a fresh and taller one (mount height varied by manufacturer), added a couple shims and that brought things into alignment.
Ended up leaving the axle and engine mounts as they were.
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Driveline Angles 
