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Yeah but if he has access to numerous m939 trucks I doubt "buy a different truck" is the technical answer he's looking for. I also have seen the mogs go for $$$$ over the "normal" surplus trucks.

if you used the 10.26 gears with the 8.05 1st and 42" tall tires it would give you a crawl of 37 feet per minute or .42 MPH with stock 6.44 gears it would go up to 59 feet per minute and .67 mph

I'm not sure if it would help but they did make 10.26:1 gears for the axles. Its a pretty decent change in crawl speed but not sure if it would be enough. stock m923 with 42" tire (11r20's or 425/65/22.5 floats) 1.79 low range,4.17 1st gear,6.44 axle at 500rpm idle= crawl speed of 114 feet per...