[1971455HO]

1971 Trans Am (LEAF SPRING CAR), not coil spring.

I swapped the original 400 trans to a 4L80E (overdrive) to make my car more derivable on the interstate. Bought the correct crossmember for the new trans, bolted right up in the original bolt holes. The trans is about 4" longer so I had a professional drive shaft company build me a shorter driveshaft. Here's my problem:
Engine & Trans are at 5* negative slope (down at rear) but my driveshaft is now at 1* positive slope (Up at rear). The driveshaft is literally running uphill to my rear differential. That makes the front joint operating angle 6*. Way to much!

My numbers front to rear are... output shaft 5* negative/down, driveshaft 1* positive/ up.... pinion is neutral @ 0*.

Figuring axle wrap at 2*-3* normal driving mode (Not Drag Racing) will just make it worse.

I need the drive shaft to be down at least 3* if not 4*. I'm hoping someone else has been here before and can tell me what I should do to correct this.

I lifted the rear of the car hoping the axle would drop from the weight as the car went up and get the driveshaft to go down, but Trans Am suspension is so stiff it did nothing, maybe 1* with the fender wells 4" above the rear tires. I need advice...
Thanks