Quick Driveline Angle Question
 

4th gen fbod chassis, adjustable torque arm.

Gonna measure trans angle, and mimic that angle with the rear end but opposite. So if trans is 2* down, rear end will point 2* up?

(then there is some adjustment for "preload" in the angle but just wanna set it for 100% street driving at the moment)

Yes

Welp, on first glance, BMR X member and or poly mount dun goofed.

Rear end is 0*, or parallel with car.
Drive shaft angle is 2* going up from rear to trans.
Trans mount is 3* up into car.

So the U joint at pinion is a delta 2* and the U joint at trans is delta 5*.

Prob enough to make noise no?

Wait, you're saying the transmission is aimed up in the tunnel?

I usually check the engine angle via the front of the cylinder head surfaces, where the accessories mount. those surfaces are 90* to the crankshaft. That gives me the engine/trans angle.

Yes. Points up from the ground into the car, 3*

I am gonna try to see what I can shim it down to without angering the solid mounts.

Ya I wonder where the issues is....and could you cut the trans mount area to lower the tailshaft?

I am hoping/banking on the trans mount shim being at fault here.

Otherwise, I will see how much of a shim distance I need on the trans mount and then make up something at work.

You have the poly mount with the shim/spacer that goes between it and the mount, yes? If so pull it out and see what you have.

I did, yanked the shim from the mount. Seemed to drop the trans back to a good angle. Will need to work on it on a lift at this point.

****.

What issue are you having?

His car wants to shake itself apart while in 1st and 2nd gear.

Solid motor mounts BRAH!

3rd gear was smooth. No excuse for 1st and 2nd non-sense.

Maybe the position of the shifter is effecting the cog?