Only consider a T56 rebuild if it is an incredible price. Unfortunately, lack of knowledge has driven the market price way up. The fact that a given T56 will shift through all the gears doesn’t guarantee that it’s a good transmission. The T56 is getting to be an older transmission and no one drives them nice and easy. Not to mention, they are forgiving units which means that it can be in bad condition and still shift though the gears. We’ve seen many T56 units that require an expensive rebuild shortly after purchase, exceeding the cost of a new Tremec Magnum.