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Old 08-13-2019, 10:22 AM   #1 (permalink)
DmaxCC6spd
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Join Date: Jan 2004
Location: Kentucky
Posts: 255

2020 HD Axle Ratios?

On the Chev & GMC sites, it lists the axle ratio as 3:42. Seem odd that they would go numerically lower, especially when I believe Ram offers 4:10.

Does anyone have a comparison chart of final drive ratios with the 3:73 axle and Allison 6spd comapared to the 3:42 and trhe Allison 10 spd?

The engine is already turning such low RPMs at reasonable interstate speeds, where will it run with this new combination? Does the computer lock out some of the gears in the trans when in tow-haul mode?

I got to see a GMC 2500 up close at my local dealership over the weekend. Looks like a beast of a truck!

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2014 GMC 2500HD SLE
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1994 GMC K2500 Suburban 6.5TD
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