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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.

Cheers,


[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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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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:smileup: 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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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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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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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?? :p
 
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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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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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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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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?
I'd have to check what my father has for gears in his 2010 Sport, but I doubt they are the 3.55s... he averages around the same as what you mentioned if I do recall.
 

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Well i have the 2010 3.7 v6 with the 3.92 rear and at 85 mph from miami to orlando at just before half a tank i had 228 miles on just 19 gallon fill up is that good or bad??
 

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Trac-Loc?

That is the real need for you if running the Hemi. I like my 3.55's but it would light up the right rear tire from a light at the slightest provocation, also fun at boat ramp pulling bass boat out of water. I had dealer bolt in the MOPAR trac-loc and retain my stock 3.55 gears, now it is the best possible for me.

Not sure if (or why not?) you could order one with 3.55 and trac-loc... The 3.92 trucks seems to have it standard with that gearing.

If you agree, try to get dealer to install trac-loc with your new truck and its 3.55 gears...
 

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I have an 09 slt crew with the 4.7 and 3.55's and 20" wheels and get around 15-16 mpg in the summer. It drops to 11-13 in the winter. If i change my truck to 3.92's or even 4.10's i would. In my opinion the 3.55's bog it down too much.
 

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^^^ i have the 3.55's with my 4.7 as well, and i also feel like it's just too bogged down. 3.73's don't seem like they'd do much for me, but i'm afraid 3.92's would be too much... also 3.92's aren't easy to find for an '02 1500..
 

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9.25 corp rear? If so then 3.92 should be easy to find since folks sell thier oem 3.92 when they regear. Unless you are narrowing your search to local area only.
 

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That is the real need for you if running the Hemi. I like my 3.55's but it would light up the right rear tire from a light at the slightest provocation, also fun at boat ramp pulling bass boat out of water. I had dealer bolt in the MOPAR trac-loc and retain my stock 3.55 gears, now it is the best possible for me.

Not sure if (or why not?) you could order one with 3.55 and trac-loc... The 3.92 trucks seems to have it standard with that gearing.

If you agree, try to get dealer to install trac-loc with your new truck and its 3.55 gears...

How much was that if you dont mind me asking?
 

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2010 Crew Cab ST 4x4
17" Wheels
4.7L
3.55.

Delivery Mileage 2709 miles.
Current Mileage 8889 miles.

Over 6180 miles its gotten a worst of 18.3 US MPG (12.85 Liters per 100 km) and a best of 20.9 US MPG (11.25 Liters per 100 km). The majority of the tanks are in the 19's (12 Liters per 100 km). All mpg is hand calculated as it doesnt have EVIC.

PS the Limited Slip 3.55 Combo became available on Regular Orders with the introduction of the Tradesman. I believe its always been available as a Fleet Order. If you are installing a limited slip in an existing truck with the 9.25 the Eaton Detroit Truetrac is a better option. Its a stronger, torque biasing, gear driven (no clutches to wear out and no friction modifier required), and more effective. Unlike a locker its very streetable. If you are buying a 2012 with the new rear end you will have to go with the factory limited slip as its the only game in town as of now.
 

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2010 Crew Cab ST 4x4
17" Wheels
4.7L
3.55.

Delivery Mileage 2709 miles.
Current Mileage 8889 miles.

Over 6180 miles its gotten a worst of 18.3 US MPG (12.85 Liters per 100 km) and a best of 20.9 US MPG (11.25 Liters per 100 km). The majority of the tanks are in the 19's (12 Liters per 100 km). All mpg is hand calculated as it doesnt have EVIC.

PS the Limited Slip 3.55 Combo became available on Regular Orders with the introduction of the Tradesman. I believe its always been available as a Fleet Order. If you are installing a limited slip in an existing truck with the 9.25 the Eaton Detroit Truetrac is a better option. Its a stronger, torque biasing, gear driven (no clutches to wear out and no friction modifier required), and more effective. Unlike a locker its very streetable. If you are buying a 2012 with the new rear end you will have to go with the factory limited slip as its the only game in town as of now.

I am guessing you do a good bit of highway driving.

I have 3.55s in my truck. I wish I had the 3.92s. There are so decent size hills where I drive and I driver about 80% in the city. If I mainly drove on the highway I am sure I would love the 3.55s that much more. I am thinking about a regear though.
 
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