1970 3 speed on a 68 273?

oldpunko77 said

Okay I,have a question before I do anything to it since I have 70 4 speed tranny so I current have short main shaft and short style exention housing I plan to do the swap since cant find A body 4 speed tranny to put in 72 318 3 speed so I,am doing swap as 340 4 speed clone on this car .

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You should start your own thread to make it easier for you. Your question is "Can you use a 70 A body 4 speed to swap for the 3 speed trans in your A body?" Or " Can you swap the A body extension housing and A body main shaft to convert a B or E body 4 speed to an A body 4 speed?" The answer to both is yes, but check the lengths and output spline size before you get too far.