Re: np 228
The New Process 228 is equipped with a differential. The NP 229 is equipped with a viscous coupler. The 228 is considerably more reliable. Keep it. The differential IS available aftermarket. The 231 and 242 will NOT interchange, as the input shaft is too small for the transmission output shaft. Contact M.S.I. Salvage at (907)452-2695 to purchase a NEW differential. Hope it helps!
I'm big. I'm heavy. I've got true four wheel drive. Therefor, I own the road!