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  #51  
Old 02-27-2011, 07:25 PM
PITA PITA is offline
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Quote:
Originally Posted by Zeus1977 View Post
I just got a 2011 with 3.92 & I am only avg. 12.8mpg perhaps I have had my foot in it a little or it needs to break in not sure, but we will see.
That's lousier than I would have expected with a 3.92, and certainly worse than my 3.55.

I tow as much as 6000 pounds with my 3.55 and I have zero complaints. A 3.92 may be better for towing, but then again so would a diesel...

But nothing wrong at all with a 3.55 as long as you stay well within the capacities.

The worse thing about the truck is the fuel ecomomy, why would I want to make it worse?
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  #52  
Old 02-27-2011, 08:39 PM
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Quote:
Originally Posted by PITA View Post
That's lousier than I would have expected with a 3.92, and certainly worse than my 3.55.

I tow as much as 6000 pounds with my 3.55 and I have zero complaints. A 3.92 may be better for towing, but then again so would a diesel...

But nothing wrong at all with a 3.55 as long as you stay well within the capacities.

The worse thing about the truck is the fuel ecomomy, why would I want to make it worse?
I have to disagree. The worse thing about the truck with 3:55s is the constant shifting! I am glad you are happy with your set up.
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  #53  
Old 02-28-2011, 11:13 PM
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I have the 3:92's, and I have a few friends with the 3:55's. Some are 2wd, most are 4wd.
Of them all, I am the most aggressive driver (I didn't but the Hemi for the mileage), and pull the heavier trailers....more often. Surprisingly, I have the best over all gas mileage.

Recap -
I drive harder.
I pull more.
I beat them in all races.
I have the best gas mileage.

Gezzz, I'm a frig'n freak!!

Overall driving style will affect your mileage much more than the gearing difference will. If you do a lot of towing, there definitely are fuel saving benefits to the 'taller' gears, as it allows the engine to turn slightly faster, with a slight less torque demand, which often equates to running in a higher gear. When I ordered my truck, I was very aware that my intended use would be best served with 4:10 gears, but since that is not an available option from the factory, I chose the closest ratio to it.

Just a side note - 3:92 gears come as limited slip...3:55 gears do not.
In our climate, limited slip has some real benefits. With the advanced traction systems on the trucks (ESP/BAS) the limited slip will assist fuel mileage by applying drive to both rear wheels, where a non-limited slip will have the computer applying the brake to a spinning wheel to help transfer torque to the one with the traction. I don't believe that accelerating with any brake on is good for mileage.
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  #54  
Old 03-03-2011, 01:12 PM
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Has anyone swaped to 3.92 on the Gen 4 4x4? Looking to do so with a possi or tru track.
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  #55  
Old 03-03-2011, 01:24 PM
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If you'll be runnin 35" or bigger tires get 4.56s
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  #56  
Old 03-03-2011, 01:34 PM
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Quote:
Originally Posted by gabrieldy View Post
If you'll be runnin 35" or bigger tires get 4.56s
I have the 22" Vipers
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  #57  
Old 03-03-2011, 01:57 PM
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i am sure that chysler would gladly swap out your carrier assembly & your warranty would still be good

a good site to look at, that carries its own warranty, i believe they have a online calculator
i wouldn't be surprised if they also have the parts needed to make your 3:55 into a Limited Slip Differential
http://www.ringpinion.com/

i believe the 3:21 & 3:55 differential is standard equipment in the 2 wheel drive Rams, because the Federal Gov't have rules that say X amount of vehicles produced must meet certain fuel mileage standards

* side note *
a little known fact, is that new Rams sold for use in Mexico & are badged as 1500s, are in truth 2500s
they build most of the 2500 & most of the heavy duty Rams in Mexico & they don't want to import from the Warren Plant
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  #58  
Old 03-03-2011, 10:49 PM
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Quote:
Originally Posted by Blue Streak View Post
I have the 22" Vipers
3.92s or 4.10s would work good.

GTYank - thanks for the post. pretty cool you can get a 2500 badged as a 1500. so do they get the 2500 tow rating?
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  #59  
Old 04-09-2011, 06:14 PM
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In tow/haul I can shift 5 gears manually.
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  #60  
Old 04-09-2011, 09:24 PM
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Quote:
Originally Posted by Blue Streak View Post
Has anyone swaped to 3.92 on the Gen 4 4x4? Looking to do so with a possi or tru track.

June I'm having it done...along with my ARH L/T's....gonna run me $12-1400 (front and rear diffs) depending on which LSD I go with
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