a833 tailshaft interchange

"It will NOT swap. You can't interchange the mainshafts on OD and regular 833 transmissions, and you would have to do that to swap the tail housing. Also, the '69 833 tailhousing you have uses a 307 bearing, while the OD tail housing you have more than likely uses a 308 bearing. So not only can you not swap the mainshafts, you probably can't even swap the tail housing."

The mainshafts won't swap like I said, but not because of the different output bearings. The 308 bearing is a 308 SG8 or SG10, which has the same ID and width of the 307 bearing. It's just taller (OD). You can change the extension housing as long as the output splines are the same large output.

Russ.