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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 01-27-2011, 10:58 PM
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Question 3.21 to 3.92

Can I expect a mileage increase or decrease from switching gears? The 3.21 seems like it would be a little sluggish compared to the other ones. I also want to put an LSD or True-Trac in it to help with the performance. I have plans for some mods down the road, like a cam and maybe some head work. Thanks!!!
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Old 01-28-2011, 08:22 AM
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Expect to lose some mileage, but see a significant increase in acceleration and pulling ability.
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Old 01-28-2011, 07:15 PM
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I lost about 1-1.5mpg going from 3.55 to 4.10. Small price to pay for the new gitty-up!
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Old 01-28-2011, 08:19 PM
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Yea going up in your gearing will bring the MPGs down. On the plus side you will get better performance out of the truck.

Your truck has 3.21 gears? If so then going up to 3.92s would be a good choice. My 07 Ram has the 3.92 gears and it got pretty good mileage before I started to mod it.
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Old 01-28-2011, 10:55 PM
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I do have 3.21 and it only gets about 15 mpg half city/highway!
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Old 01-29-2011, 02:35 AM
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i have 3.92s and befor my magnaflow and my superchips i was getting 17.5 but i havent been able to get back on the hy so im not sure how its doing now.... i bet not to good beings my tires are getting wore with my new mod's love the new sound and the superchips!!
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