I think that the engine side 72 up 6cylinder &66 up V-8's are the same. I don't know about the tranny side. If I am not mistaken, the depth of the 6 cylinder is 6 inches and the V-8's are 8 inches but the 72 gremlin V-8 is the same as the 6 cylinder. (72 only). 73-76 are 8 inches deep. My car has the T14 in it. Tom 72 Gremlin X 304