Question about Driveshaft Angle -- Coyote with MT82 Transmission

[Emosgarage]

Hi All, building a Gen 3 Coupe with a Gen 2 Coyote and I used the stock transmission (since I bought it from a wrecked car). I have the formacars adapter for the shifter, which seems to have worked well and put the shifter in a good position in the cabin. I have the Moser solid rear axle. I had to get a custom driveshaft made, because the stock Mustang transmission has that unique output (guibo?). Anyway, I got it made at a shop, brought it home and connected it loosely, and I am checking the angles using a digital gage I got at Lowe's. I'm showing -1.3 degrees at the transmission yoke, and .1 degrees at the differential yoke, but the angle on the driveshaft I cannot seem to nail down (with it being round, as I move the gage around, I get different numbers). I'm seeing anything from minus 5.9 to minus 7.2. either way, it's a big delta from each end. My understanding is that you typically want 1.5 degrees differential across the 3 points, not 6 or 7 degrees. Here are photos:
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A few questions: (1) visually, from looking at the pictures, do these numbers seem right? (like an unacceptable angle), (2) assuming so, is the fix to get a thinner transmission support to try to bring the transmission end down a few degrees? right now, the support is about 2.5 inches thick, (3) If I get a thinner transmission support, will it come down naturally, or will I have to raise the engine in the mounts to try to tilt the entire drivetrain down? would that require different motor mounts, or just bolting the existing mounts higher on the chassis mount pads? (4) the other option would be to raise the rear end somehow in the chassis, but with solid rear axle, I can't really do that without affecting ride height (the car would sit funny if I raised the rear shocks to the higher mounting position (thus lowering the rear of the car) and kept front on lower position).

Any other ideas/suggestions? has anyone run into this using the stock mustang transmission? right now, this is the last open item standing between me and go-karting this thing, but I don't want to destroy a driveshaft on my first drive. Thanks!

[Skuzzy]

The critical part of setting up the driveshaft is getting the transmission output shaft and pinion shaft parallel to each other. Failure to do that will result in problems ranging from errant driveline vibrations to catastrophic u-joint failure.

Next is getting some angle to the driveshaft between its respective connection points. For a driveshaft this short, 1 to 2 degrees is adequate. You need to have some angle to prevent u-joint failure.

If you draw a line through the center of the crankshaft, that line should be parallel to the body of the car. Torque moments from the engine need to rotate around the centerline of the crankshaft. If the engine is cocked it can put additional stresses on the motor mounts.

I do not have my kit yet, so I cannot say what would be the best way to accomplish the above.

[q4stix]

Is your car sitting with the weight on the wheels or is it currently on jack stands? It looks like it might be but I can't tell for sure.
If so, I'd think a spring adjustment might be in order if you can adjust the preload height. It could also be a matter of the transmission mounting plate being on top of or below the chassis mounting tabs.

[Emosgarage]

Thank you both. I actually realized I was focused on the driveshaft angle and not the transmission and pinion angles. Those are roughly parallel (within a degree). So I actually think it’s fine. I called the guys at Formacars and talked to them about it, and it made me more comfortable. Thanks all.

[Fixit]

Probably the most concise and easy to understand explanation of driveline angles & phasing...

https://youtu.be/Idk3BVDVHq4