Thanks guys, Ok, I’ve just spent a couple of hours measuring and measuring and measuring to verify what I’m getting. Right now as it sits, its a standard 1973, Cuda, 340/727, 8.75. factory springs with poly bushes, I have 26.5" high tires on it and the rear fender lips are 25.25" off the ground so I wouldn’t say its lowered as such or even sagged all that much over the years, not significant enough to give me the angles im getting.
anyway. I started at the engine and zero'd my digital angle finder (used an engineers square on the harmonic balancer, then also checked it on the top of the trans lug they have machined surfaces parallel to the centreline, then also on the bottom of the rear trans mount, all gave me zero so good to go) I then attached it to the driveshaft, the driveshaft is at 2.6* up from the eng/trans centreline. I then moved to the rear, zero'd on the driveshaft and checked the pinion angle, it is at 2.5* nose down to the tailshaft, like I have in the image above.
I loosened the two bolts holding the trans mount to the trans and jacked it up approx 3/8" and only took .7* out of the eng/trans to driveshaft angle so its looking like I will need to jack the rear of the trans up prob 3/4" at least to get that line anywhere close to zero!!!! this will also increase my pinion angle to, I'm guessing something like 4*??
So I have two dilemma’s, the first is the existing driveline angle particularly the eng/trans angle and how to resolve it,
The second is, setting the perches up on the Dana, yes I can put it in place without them welded , set the angle and tack them but that is problematic for other reasons right now. As it stands, with the angles I have I’m pretty much going to set it up per a normal E Body (7 degrees up when perches are level.) as I feel the B Body pinion down an extra 3 deg might be too much.
