Is there a positive traction differential available for my NV1500.

What is your question?

If my NV1500 is sitting on firm, but wet, grass covered, almost level ground one of the drive wheels will spin. I've put aggressive tread tires on it, but to no avail. Yes, I know how to ease forward and not break traction, but this is the worst. Adding a few hundred pounds over the rear axle helps, but this is unsat. I carry a come-along and 100 ft. of line for these occasions.