Did I just kill my 200-4R

[boss_hoss]

So here's the deal. I'm finishing up my build. I've got a 1969 Pontiac tempest with 400ci Pontiac engine and rebuilt 200-4. I installed the tranny in my garage, Line pressures looked good. Took it to the local transmission shop and they said everything looks good. Now I've got approximately 50 miles on the transmission and it's starting to make a gridnding noise in revers and Low, doesn't seem to be making noise as much in 2-3. Also noticed some trans fluid splatter on the underside of the floorboards near the output shaft. A few questions:

1. I've read that although this is a mostly " direct swap" between the th350 and 200-4 some people have run into driveshaft length issues. My car is lowered 2" could that be part of the problem? I'd guess if it was tool long and I hit a good bump it might jam the yoke into the tail shaft.
2. What's the best way to check driveshaft length to make sure it's correct.




Any thoughts/ suggestions would be greatly appreciated as I'd really like to get this fixed and not have it happen again.