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-   -   3.92 vs 3.55 (http://www.ramforumz.com/showthread.php?t=143226)

ffpmason 05-25-2013 05:39 PM

3.92 vs 3.55
 
Okay I have finally found a truck that I love with every option on it I want (except one) at the price I am willing to pay. Only problem is that it is equipped with 3.92 gears. I am wanting 3.55's since I don't tow that much. Basically I am asking for you guys to chime in here let me know how much real world difference in fuel mileage I should expect. Obviously moy foot will big the biggest factor. Saleslady claims there wouldn't be a noticeable difference in fuel economy. Ummmm:sad: okay I grew up on a farm and wasn't born yesterday so lets hear it from the people that know.

brandonjansen 05-25-2013 06:01 PM

Partially depends on what kind of driving you do and what you plan on doing to the truck. If you do mostly city driving and/or plan on putting bigger tires on it I'd definitely go with the 3.92's. If you do a lot of highway driving and plan on keeping a stock tire size then 3.55's will give you better economy. Even fully stock I doubt you'd see much of a difference in MPG. 1-2 max.

dafoot 05-25-2013 06:25 PM

There is a reason why You hear of people changing out their 3:55 gears to 3:92s. You will like the Ram with 3:92s as I do. I had a Ram with 3:55 gears and hated that gear set.

ffpmason 05-25-2013 06:45 PM

Why did you hate your 3.55s my current truck is a gmc with 3.42s and I get along with it fine I am a 50/50 mix of city/highway with very little to no towing. Main reason is 2 guys I work with bought I dentical fords 3 months apart only difference is one had 3.55s other had 3.73s guy with 3.55's getting 2-3 mpg better obviously driving style had to come into play.

SI Integra 05-25-2013 07:36 PM

My 02 4.7 has the 3.92 and I cannot imagine it with 3.55 gearing. The 03 hemi has 355 and it does everything I need of it and more!

dafoot 05-25-2013 08:15 PM

Quote:

Originally Posted by ffpmason (Post 1107644)
Why did you hate your 3.55s my current truck is a gmc with 3.42s and I get along with it fine I am a 50/50 mix of city/highway with very little to no towing. Main reason is 2 guys I work with bought I dentical fords 3 months apart only difference is one had 3.55s other had 3.73s guy with 3.55's getting 2-3 mpg better obviously driving style had to come into play.

Any wind, hills would make the 2010 Ram with 3:55s hunt for gears. The constant down shifting drove me nuts. Never mind pulling anything. I am glad you are happy with the GMC. I rode with a buddy with the same set up as yours pulling a 18' boat. NOT impressed. I suppose the higher gears are ok if you live in a area where there is no wind or hills. And yes, the buddy with 3.73s is getting worse mpg cause he is having a lot more fun!

ffpmason 05-25-2013 09:52 PM

I didnt say I was happy with it just that I got along with it. I wouldn't hook onto an 18 foot boat with my truck unless I had to. And you mentioned fun that is my other concern my tire budget would probably literally go up in smoke with that low of a gear. I was just curious if it made that much difference either way I would bet both setups would do better on gas than my 06 gmc.

32seventeen 05-25-2013 09:56 PM

I have 3.92 gears in my Hemi Ram and still get great gas mileage (for a 390hp truck). Any really fast highway cruising I probably get a little bit worse than the 355 gears, but driving around 60mph, I am still getting over 20mpg.

TheSatinPumpkin 05-25-2013 10:50 PM

difference would only be around 100-200rpm in OD and getting up to speed would sway in 3.92 favor.

LeftCoast 05-26-2013 12:46 PM

Your gmc has a true 6 speed , where as ours is really a 4 speed with 2 overdrives. I have the 3.92's and am the weekend tower ( 25 foot travel trailer ). Not once have I ever thought I wish I had 3.55's over the 3.92's. Even for daily driving its nice to have.


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