Originally Posted by RickCJ

A 24 valve Cummins VP44 is electronic controlled, set to around 1/2 throttle from Dodge. When you add a box and tap the wire you are giving your truck full throttle! The rest of the truck is not up to the power of the engine, the tranny is too weak and the exhaust is too small! You can break things if you run it too hard. The reason a pump dies when you add a box is because the pump wears a groove from 0- 1/2 throttle and when you all the sudden go to full throttle it can bind in the groove and break! And your truck just stops dead. Most don't bind and run good. If it's going to bind it will break ASAP you tap the wire, usually the 1st time you run hard thru the gears. Stay close to home. The pump is no big mystery, as reliable as any other part of your truck. My last truck had over 250k on the oringinal vp. My new truck needed 1 at only 85K. My alternator only lasted to 50k!