I'll have to check on the stock shaft. The new one is 2" OD. It's my initial impression that they are the same. But the shaft diameter is an issue at the exhaust heat shield. It's the rezeppa joint that hovers over the captured nut in the crossmember. I had the back bushing in the diff replaced recently. I think that helped a lot to keep that from rubbing. I guess I should also check the diameter of that joint on both to compare.