There are some major differences between the two OD transmissions. None of the external components, gears, or shafts interchange. It's possible some of the internal BW parts interchange.
The later unit is a full syncro Saganaw. The main physical differences are the side cover and the output shaft splines.
Both are similar in length, perhaps only 1/2" overall differences. The early trans will bolt up to the bellhousing. Most of the early units had a 16 spline output shaft, some of the later versions had the 28 spline output which would be the same as the Saganaw.
They have a completely different side covers it terms of spacing and shifter arms. That could possibly be overcome as some of the later transmissions have been modified to be used in earlier vehicles.
It could be somewhat expensive to rebuild the 67 trans but would likely be worth it. You also run the risk that the 64 trans is worn out also and needs to be rebuilt.
Fred
Last edited by rfs56trk; 07/19/2016 4:16 PM.
