This drive shaft is cut and balanced for t56 swap if your running the factory 10 bolt dif. Right now the yolk on it is for the big spline on t56 magnum. If you have a factory t56 you will have to change that. I am not sure the length difference between the magnum and just the t56 but I don't think I had to cut it for the magnum so the length should be good for either trans. Total length on this drive shaft is 52" and 3/4 that is u-joint to u-joint.