Don't cut a hole in your pan - rather save it for someone who doesn't want to use a repopped fiberglass one.Īs far as driveability goes, the 4spd basically can be driven 2nd gear for starting and then 3rd and 4th for road driving. The floor pans are plentiful in wrecking yards while the metal 3 spd pans are not. They are interchangeable as far as bolting in, but as Ray mentioned, you will need a new floor pan to use the SM420 4 spd. Slo - I have several AD vintage trucks with both versions of trannys.
