just wondering if anybody has a big block 4 speed trans
They are all the same basically, only the 426 & 440's had an 18 spline instead of the 23 spline, this was used even on the /6. The rear extension housing is the main difference, the E body must have 2 pads on this housing, the rear one is for the E body. Check
www.slantsix.org , it has plenty of info, enough for you to be informed.