1969 Falcon Build

[rixtrix1]

You need to run some angularity, up/down, in the driveline as the pinion will rise on acceleration, how much depends on type of transmission, auto/stick, but having the pinion at least 2 degrees down in relation to the driveshaft with a matching angle at the trans junction is a good start. if you make everything straight inline at rest, it can bind on acceleration. There's tons of discussion online about this. I love this body style and it's often overlooked; great choice!
My S10 is lowered 4.5" in the rear and it took a 4 degree shim under the leaf spring to get the pinion low enough to achieve a 2 degree down pinion angle. as the pinion is now higher than the transmission( whose mount is also raised 3/4").