Yes, theoretically, although I have not personally run into that happening. If the gearbox leaks, it can cause the resevoir to run dry, ruining the punmp. Or, if the gearbox acquires increased resistance, it can eventually take its toll on the pump. Heck, even running big tires without upgrading the pump can do bad things.

In the case of really big tires, and rockcrawling, I'd advise upgrading to an AGR Super Box and Super Pump. If the vehicle is a daily driver, I'd opt for the Super Box 2, which has a variable ratio.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.