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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 03-26-2009, 12:43 PM
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Default 3.55 Axle Ratio vs. 3.92 Axle Ratio

Has anyone test drove to compare the 3.55 vs. 3.92 ? I just picked mine up yesterday and I have the 3.55 (It's kinda tough to find one with the 3.92). Anyway, I love the truck and couldn't be happier so far but, I guess I was just wondering.

BTW, I decided to put the Q. here rather than in drivetrain because it is a performance question.

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[DMD] 3.55 Axle Ratio 3.550:1 axle ratio; Requires: [EZD] 5.7L HEMI V8 VCT Engine;

[DMH] 3.92 Axle Ratio 3.920:1 axle ratio; Rear limited slip differential
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Old 03-26-2009, 10:13 PM
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You should see better mileage out of the truck on the highway...... Less RPM's. The 3.92's pull better.

Don't worry- - - - - - - - be happy!

JB
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Old 03-28-2009, 08:47 AM
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I agree.

If you're wanting to play at the strip get lower gears but you will sacrifice MPG.

If you want MPG leave it alone.
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Old 03-28-2009, 10:01 PM
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this all also depends on your tire size your going with on this but overall long run everday driver going with the 3.55 gears is your best friend because everyone here know's how well dodges do on gas mileage lol but my truck has 4.10 gears front and back so you know how mines doing, but it will tow a house down
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Old 03-29-2009, 11:10 AM
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I like the 3.92 in mine, it is the 4.7 so that helps it feel a bit peppier.
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Old 03-29-2009, 12:18 PM
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I got the 3.55 as well. I figured I will be driving around on highways more than at the track. Although I will be there!!
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Old 03-29-2009, 05:41 PM
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I have the 3.92 rear end with the 5.7L and I like so far. My father has an '02 with 4.7L I think he just has the 3.55 rear end, and my brother has an '04 5.7L, but I'm not sure if his a 3.55 or 3.92... My brother also has a K&N CAI and dual flowmaster exhaust system... My uncle has an '06 and says he gets better than my brother, which could be due to the MDS obviously. I average 14.5L/100KM mostly highway.. and can't get any better than that... but city/hwy combined I sit around 16-17L/100KM, which really depends on how heavy my foot is during that tank. Now take into respect, I am getting my numbers from the OHC... My dads '02 has nothing done to it, straight stock.. and I think he averages about 16.5L/100KM so, you tell me where its at??
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Old 04-03-2009, 02:35 PM
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Hey Danstona! Where abouts are you in ontario? I am in Brampton, and I frequent Mississauga quite often. I drive an 05 black ram, with two silver stripes, and 22" five spoke chrome rims! Would be pretty cool if you saw me around or something!

Take care bro!
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Old 04-07-2009, 10:08 AM
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I'm actually out Kitchener way more, I rarely travel to Mississauga though. I may be out in Milton for a few days to do some training for a temp position if they ever let me know when and where! Be nice to work and not be on the EI for a while. I'll keep my eyes peeled for your truck. There isn't much that separates mine from other Hemi Sports, except I have a chrome bug grille now, and smoke front licence plate cover... oh, and my licence plate says "DANSTONA" go figure!
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Old 09-30-2010, 11:16 AM
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I just picked up a 2010 Ram 1500 Laramie with the 3.92 rear and I was originally worried about how my fuel mileage would be. I have only had it for 800 km's but in that period have averaged 13.8L/100km city and highway, far better than anticipated. I looked high and low for a truck with the 3.55 gears because I am on the road quite a bit for work. Definitley not dissappointed with the 3.92 gears and would be surprised if the 3.55 were that much better on fuel at all. The cylinder shutoff feature makes a huge difference and drops down to four at 120kmh. I am curious as to what numbers a 2010 with 3.55 is running... anyone?
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