Guys, I believe that my ST300 has some major issues and instead of trying to rebuild it, I would like to swap it out for a Powerglide or TH350. Part of the reason for my decision is that I believe the ST300 is a switch pitch and I don't think it's the original trans, nor is the switch pitch solenoid connected. The motor is the OHC 6.

Could you tell me if the Powerglide and/or TH350 is a drop-in replacement for the ST300? I know that I probably need the kickdown linkage in either case, cause the ST300 achieved the kickdown with electric solenoids inside the trans.

The reason I'm asking if it's a drop-in is because I've seen references to the TH350 that say "long tailshaft, short tailshaft" etc...