Okay, guys, if anybody is still checking this thread, I found some info (maybe outdated) on these 1545 trannies.
Gear ratios: 3.45, 2.25, 1.41, 1.00 to 1.00 and R 5.02
It shifts 1c, 2c, 3c, 3L, 4L . C = converter, L = locked clutch
L 27.2", W 20.7", H 18.9" and weighs 302 lbs Mounts to a #3...