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I think that redline is 2100 RPM. Did you account for both the transfer case and differential ratios?

Thanks! Yes, I am still looking for a hard top.

Thank you! I'm still curious about the other gear ratios, but the top gear was what I most wanted to verify. If I have all of the numbers right now, I come up with a top speed of 57 MPH at 2100 RPM with 43" diameter 11.00R20 tires, which looks about right to me.

I found the transfer case gear ratios in the wiki. Still looking for the other ratios, though...

I would like to know the transmission, transfer and differential gear ratios in a stock M923 (M939 series) truck. I haven't managed to find that info in the TMs so far, and I'm not positive that the generic info I found online for MT654 transmissions is correct for whatever is in the M923. I...