Hello all,
I swapped in a Tremec 3550 in my 67 coupe. It has an early 302 with matched-balance flyweel, a clutch for a 93 Cobra, and an 8" Currie TSD rear. I got the conversion parts, including the driveshaft, from someone I thought was a reputable supplier in California. Unfortunately the crossmember was wrong (I think it was for a T5 conversion) the driveshaft too short (the yoke is scored, and only at the end) and also out-of-round and out-of-balance. "Buy more overpriced parts" has been the supplier's solution, and chuckling at me that I can't get his incorrect and poorly made parts to work. And no warranty, naturally.
Not being a drivetrain expert, and having trusted this supplier to have made accurate measurements and sent me correct parts, I then had a local classic Mustang shop look at it, and they stuck a driveshaft and yoke in from I think a stock V8 + C4 or C6 car. It seemed ok at first, but after doing a little research, I think this one is too long; it still vibrates (not as bad) at highway speed (2500+ in 5th) and I think it bottoms out in the transmission from time to time. It grinds and groan when turning sharply at slow speeds. Ouch. I don't think it's the rear end.
Now I'm using a Windsor-Fox crossmember apparently designed for a 1967 Tremec conversion. I done my best to eyeball the drivetrain alignment carefully, and believe it's fine; everything fits, and is centered. The angle is not too severe from the trans. to the driveshaft, and again, seems to match up with "this is good" pictures I've found from M&F tech articles. I think the final issue is the driveshaft. Can ANYONE tell me how much slip yoke travel there should be, how long the yoke should be for a Tremec, and/or any other measurements or bases of comparison so I can FINALLY get the thing to function correctly?
THANK YOU.