TH 400 & Jetaway
#4
All I did was look up the output shaft seals for the transmissions to determine what size they were. The output shaft seal Jetaway and the TH350 is 1.502" ID, and the TH400 is 1.887" ID.
#5
Yes, techniques like that are how I usually find out if parts are the same or not. As for GM transmissions, every Oldsmobile RWD trans (auto and manual) use the same output shaft EXCEPT the TH400 and the M22 Rockcrusher.
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