if you can find/afford an SG center, its about 2X as strong. Otherwise, just bearings and races. If its a 75 Dart, I would look at a 8.25 they both have the LBP right? Many more gear options and availability. The Dakota 7.25 is NOT the same thing.
.........is this a slant 6 or 318 car , as stated above but, any bigger motor than them I would be looking for a 8 1/4 or 8.75.............kim..........