These dual coupling 4 speeds are fantastic if you can find someone to rebuild it that really knows 'em well. Make sure they take a good look at the coupling cover for cracks. That pretty much their only weak point.
First gear is a monster low 3.97. Even the 2.55 second gear is steeper than 1st in most 3 speed autos. The transmission is "locked up" once in second gear and uses a unique split torque design that's incredibly efficient. Believe it or not, dual band/dual couplings were the most efficient automatic transmissions around until lockup torque converter trannys became common in the 1980's.
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