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Re: My First C60..
Going off those numbers you're probably going to want to keep an eye out for a Brownie box or a higher ratio differential carrier. My '61 5000 GMC has 6.50 - 9.04 for the rear. 5th gear direct in HI was about 35+/-mph at 2000rpm. Put a 3spd Spicer 5531 with a 27% overdrive behind the main transmission, picked it up to 45-50mph.
Very cool truck! Highly recommend keeping those heavy axles and Daytons. A C60 on 1-ton axles just don't look right...
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