GM Pump Rub in Transfer Case
GM transfer cases 261 and 263 are prone to a condition known as Pump Rub. It is where the pump used to circulate the fluid in the transfer case wiggles back and forth wearing a hole in the transfer case, allowing fluid to leak out and if not caught the loss of fluid will destroy the transfer case.
Know of this condition I installed a modification to prevent the pump rub, but I was too late and had a hole in my transfer case not knowing it. I still had plenty of fluid so the damage was limited to the case housing.
I am currently in the process of replacing the damaged transfer case housing with the pump rub mod to prevent damage in the future.
My point is to frequently check the fluid level in your transfer case, and at the first sign of leakage if you see any, perform the pump bub fix.
Jim
Know of this condition I installed a modification to prevent the pump rub, but I was too late and had a hole in my transfer case not knowing it. I still had plenty of fluid so the damage was limited to the case housing.
I am currently in the process of replacing the damaged transfer case housing with the pump rub mod to prevent damage in the future.
My point is to frequently check the fluid level in your transfer case, and at the first sign of leakage if you see any, perform the pump bub fix.
Jim
