what kind of 4 speed tranny was in the slant six dusters?

Tobin_74_Duster said

also whats a good 4 speed tranny thats common to find that would fit in my 74 duster 318

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Any A-body or F-body 4 speed should fit in the Duster. The B/E body trans will fit but you'll have to make an adapter so the shift linkage is in the right spot.