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  #21  
Old 04-30-2011, 08:13 AM
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I have a 5.9ltr and 3.92s in my ram and love them (except the gas milage). I also had an old Dakota with a 5.2ltr. and 3.92s, that truck would out pull some fullsize trucks. My wife's durango has the 4.7ltr and 3.55 gears and it does shift a lot on the highway as soon as there is an incline. That being said you have to know what will work for you. I tow a boat and also have a job where I have to plow snow so I love the limited slip for driving in unplowed snow to get to work. You will get slightly better mpg with the 3.55 but not that much. On the highway at 65 mph my wife's durango runs about 1600 rpm's (w/ the 4.7ltr) while my truck runs around 1900 rpm's (w/ the 5.9ltr). My truck gets about 18.5 mpg and the Durango gets about 20-20.5 depending on conditions. As a side note my dad has a '95 standard cab ram with a 5.9ltr and 3.55 gears and his truck shifts alot on the highway.
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  #22  
Old 04-30-2011, 08:25 AM
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Stupid noob question....I see lots of people talking about MDS kicking in and out....can someone please tell me what MDS is? Its probably one of those things that I will slap my forehead when I find out and say "I should have known that!" but currently I am having a brain fart and cant figure it out! Thanks!
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  #23  
Old 04-30-2011, 11:33 AM
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MDS - Multi-Displacement System.

It's the thing that switches your 8 cyl engine down to 4 cyl under low power requirements.
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  #24  
Old 04-30-2011, 12:16 PM
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Ahhh....dont think mine has that....does it?
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  #25  
Old 04-30-2011, 12:44 PM
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Nope. Came out in the 2006 model year .
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  #26  
Old 04-30-2011, 01:13 PM
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if 70% highway with no towing or drag acceleration then maybe 3.21's
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Originally Posted by P Rod View Post
So I have a narrowed my search down to two different Crew Cab Sports. Both well equiped. One a little more than the other (back up cam and sun roof) two different dealers for approx the same price. the one with better equipment has 3.92 gears. As about 70 percent of my driving will be hwy miles, do you think it will hurt the already poor MPG? By the way I will not be doing much towing and no drag racing.lol Thanks
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  #27  
Old 04-30-2011, 01:46 PM
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3.55's here and no regrets. I fully researched the trucks before purchase and drove several of them. The truck is used to pull very light trailers, 2 snowmobile/2 dirtbikes/14' boat on flat straight highways. I have seen no gear hunting when going up a hill.
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  #28  
Old 04-30-2011, 05:53 PM
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For my money the slight gas saving with the 3.55 rearend over the 3.92 is more then made up by the punch the higher numerical ratio supplies. FWIW, if you're just interested in limited slip check back with your dealer. When I ordered my truck in late March the salesman mentioned that limited slip was not an option with the 3.55. Just sayin', no idea if he was blowing smoke and I didn't press it since I was going with the 3.92 anyway.
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  #29  
Old 04-30-2011, 06:52 PM
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My point which everyone seems to miss that hasn't run both in there truck; is you will not get better MPG with a 4X4 in Quad or Crew cab by going 3.55 so get the 3.92
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  #30  
Old 05-01-2011, 06:48 PM
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So then can someone please explain to me how running a 3.92 will get you better milage when your engine is running more revs on average??? Yes, the 3.55 may kick down more often, depending on conditions, but otherwise the 3.92 will nearly always run more revs. It's illogical to claim better economy, and can mislead buyers who are trying to come here for an informed opinion.

I ordered mine with the 3.55 after testing everything I could get my hands on. In the end, the one thing that told me to get the 3.55 was that Dodge released all the press trucks (that would be tested for acceleration AND milage) with 3.55 ratios. That told me that they thought it was the best combo of fuel economy and pull.
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