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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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  #11  
Old 10-08-2010, 10:21 PM
Danstona Danstona is offline
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Quote:
Originally Posted by Beta Project View Post
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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  #12  
Old 10-15-2010, 09:46 AM
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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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  #13  
Old 01-05-2011, 12:58 PM
djcwardog djcwardog is offline
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Default 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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  #14  
Old 01-05-2011, 01:11 PM
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wedgeheaded wedgeheaded is offline
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Quote:
Originally Posted by midnightram View Post
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??

That would be 12MPG.
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  #15  
Old 01-06-2011, 03:03 PM
929rob 929rob is offline
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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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  #16  
Old 01-10-2011, 02:28 PM
JakeRam02 JakeRam02 is offline
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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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  #17  
Old 01-10-2011, 02:35 PM
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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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  #18  
Old 09-23-2011, 09:07 PM
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Quote:
Originally Posted by djcwardog View Post
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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  #19  
Old 09-24-2011, 08:31 AM
Gene K Gene K is offline
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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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Last edited by Gene K; 09-24-2011 at 08:54 AM.
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  #20  
Old 09-25-2011, 10:04 AM
cody0707 cody0707 is offline
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Quote:
Originally Posted by Gene K View Post
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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