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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 08-04-2011, 04:29 PM
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Default Anyone gone from 3.55 to 3.92

I have a friend that has some 3.92 laying around but was wondering if there is a difference felt which im sure there is but was it a big difference and HOW DID YOUR GAS MILEAGE CHANGE
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  #2  
Old 08-04-2011, 04:45 PM
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Isn't it like .13 ratio or so for every 1" of tire. So it could be the close to going from 30.5" tire to 28" tire..
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Old 08-04-2011, 06:35 PM
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you running 3.55 in that beast??? gas mileage wont change a hole lot but you will get a little more grunt from a dig and better for hauling/ pulling and if they are free worth the swap IMO
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Old 08-04-2011, 06:45 PM
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He has 4.56's now on the beast. Maybe its for the 10.
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Old 08-04-2011, 06:50 PM
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That's what I was thinking too! I was also looking at a cheap 3.92 swap, but I want an LSD or True Trac with it!
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Old 08-04-2011, 07:28 PM
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i was looking into it, parts for me to do it are around 2k plus 8 hours shop time. So if you can get them for free i would do it in a heartbeat! :smiley_thumbs _up:
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Old 08-04-2011, 09:45 PM
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No guys im talking about my stock 2010 not my daytona. Im very happy with the 4.56. I was asking cause i want to see if there is a difference in gas mileage on the 4th gen with the 3.92 gears
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Old 08-04-2011, 10:09 PM
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This isn't from experience, but it should be the same. If anything, city mileage will increase, and as for highway, it's only a couple hundred rpm difference at 70mph, should be roughly the same.
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Old 08-05-2011, 11:38 AM
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Sweet i gonna do it then
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Old 08-05-2011, 10:03 PM
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City goes up slightly and highway goes down slightly...the 3.21 gears I have are great on the highway, but I get crappy mileage in town....Same way the 4.56's would be opposite!
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