Those BW T-50's are notoriously weak trans, also I never cared for the shift pattern on them, with reverse left and back, and 1st gear left and forward. Road racers like that pattern as they seldom use 1st gear after the initial start, that way the 2nd to 3rd shift is forward and back.
I broke several of the BW T-50's in the Astre I had with a Iron Duke for an engine, and a car that was at least 1200lbs lighter than any cammer. I would recommend a T-5 as they are much stronger and have a conventional shift pattern. They also have the intregal shifter.
But back to your original question I think Jeff is correct I do not think the tail housing is a direct swap between Saginaw 3 and 4 speeds. I only have two 3-speeds out in the shop and don't have a 4-speed to compare it to. Maybe if you post pictures of your transmissions it would help.
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Jeff R
60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
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