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Old 12-13-2011, 12:53 AM
09ramhvac 09ramhvac is offline
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Join Date: Dec 2011
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Vehicle: 2009 Dodge ram
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Default 3.21 vs 3.92 mpg?

Has anyone ever switched there 3.21's for 3.92's? and if so what did it do your mpg on the highway? I have a 09 2wd crew with 20" wheels, I do mostly highway driving but where I live theres alot of small hills and it seems like my truck rarely stays in overdrive when climbing. I think my truck is geared way too high and I personaly think that if I were to switch to 3.92's the truck would stay in overdrive longer and work less to climb these small grades resulting in better mpg. But I would like to hear from someone who has first hand experience with this before I spend the money on the swap.
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