I would expect the 3.21 axle and the 3.92 axle to have different EPA ratings..They do not..I do not need to pull heavy trailers but the truck I want on the lot has the 3.92 axle..How much more gas will it burn at highway speeds with no load?
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Rear Axle Ratio
- Thread starter Lawman
- Start date
There are too many variables to answer this. We have many, many threads on this.
Some with 3.21 get worse mileage than some with 3.92. Some with 3.21 have had just as good towing experience as 3.92.
With the 8spd, your driving style has way more to do with mileage than the gears ever will.
Some with 3.21 get worse mileage than some with 3.92. Some with 3.21 have had just as good towing experience as 3.92.
With the 8spd, your driving style has way more to do with mileage than the gears ever will.
riccnick
Ram Guru
Please read this thread for any and all (and probably too much) info on the differences between the rear ends.
5thgenrams.com
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3.21. vs 3.92 gear
I’m looking to place an order and I’m not sure of which gear ratio to order. 95% of the time I will be driving the truck empty. Gas mileage is important to me so I’m ordering the e-torque engine. I tow a small trailer that weighs 4000 lbs and only do it 6-8 weekends a year. My concern is...
5thgenrams.com
Welcome to the forums
Wow! Lots of info....Thanks! I read through 4 pages but still not clear on why EPA ratings are the same..Please read this thread for any and all (and probably too much) info on the differences between the rear ends.
3.21. vs 3.92 gear
I’m looking to place an order and I’m not sure of which gear ratio to order. 95% of the time I will be driving the truck empty. Gas mileage is important to me so I’m ordering the e-torque engine. I tow a small trailer that weighs 4000 lbs and only do it 6-8 weekends a year. My concern is...
Welcome to the forums
riccnick
Ram Guru
Because of two things. 1: the epa does not require the trucks to be re-certified based on rear end ratio, and B: the unloaded mpg isn't very different between trucks with the different rear ends. Keep cruisin around the forums, there's tons of talk about how the mpg difference is essentially zero.
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