The 67 to 70 Mustangs and Torinos with 390's used 28 spline transmissions. If it is from a 69 or 70 Mustang with 31 splines it is from a 428 CJ or a Boss 429. Get the tag number because if it is a Mustang CJ or Boss 429 trans it would be worth at least twice as much as one from a 390 car.
Frank
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Two 427 Tunnel ports -Two 428's!
