Thanks for the reply; after digging further I checked and had voltage to the directional soliniod with 150 psi pump pressure with 150 psi fwd/rev pressure and proper inching valve operation with a pressure gauge. After checking all that I removed both drive axles and found the left axle in 6 pieces. Was able to retrieve all the pieces (I hope) and ordered a new axle. I'm going to try to drain and clean the diff as well as I can; any suggestions on cleaning the diff? Thanks again for the reply.

the backup alarm is/should be on a seperate circuit from the circuit that provides the drive signal
how about a serial number, and letting us know if this unit has a working seat switch?