3.21 vs 3.55
Ram has built a number of 1500s, 5.7 hemi's with the new 8spd trans. Some or most of them have the 3.21 gears. The tow rating is about 2,000lbs less than the same truck with 3.55s regardless if the tr...
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Looking at the ratios you've posted I would think the 8sp would have a pretty big advantage at getting a load moving...the 4.71-3.14-2.1 first 3 ratios seem pretty well suited to getting from 0-40mph which IMO is the real-world performance that's most important.
