Anyone know this rig? He left before I could talk to him. Diesel, definitely didn’t sound like your normal 4bt, and sits awfully low for it to be that engine.
Stock fifth gear on all 3053s is .78:1The stock tires on the M37 was a 900x16 which is 35" OD or a tad more depending on tread. If it had the military Spicer 3053A transmission which has a .85 OD you'd be pushing 2390 RPM @ 60 MPH. If you had the NV4500 which has a .73 OD you would be running 2053 RPM @ 60 MPH which would be much better. You'd only be turning 2224 RPM @ 65 MPH. Might get a bit scary in that vehicle. They weren't really designed for interstate cruising. Most of the time they probably ran 45 MPH or less.