'94 5.0 and 3.8 transmissions are for sure interchangeable, but the v6 transmission has less clutches, which might cause problems with 'spirited' driving due to slippage. It's not too hard to fix, and they're pretty much the same, otherwise. If you intend to be gentle with the car anyway, it probably wouldn't even be a problem.So Hubby hopped in my 94 Mustang GT 5.0 today and no reverse! He's checked most everything and seems to have concluded the tranny is toast. He has a 94 Mustang 3.8 that has a great tranny but the body is shot! Now I've been searching and getting conflicting answers so will a 3.8 V6 automatic tranny work in the 5.0 V8?