All the trans problems occurred during heavy tows (11K-18K lbs, but never overloaded. I will never own another truck with an NV4500 or G56 if I do any towing, why they tried an aluminum trans (G56) with Cummins torque is beyond me. The injector problems were both ends, wide open hydrauliced the engine and injector went dead burning a piston. I will definitely use a separate filter on my next truck.