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  #1  
Old 09-01-2013, 10:09 AM
Scott H Scott H is offline
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Default Which rear end to get 3.21 or 3.92?

Chrysler is swapping out my 2013 Big Horn for a 2014. I have the 8 speed 3.55 and love it but 2014s only come in 3.21 or 3.92.

I tow a fishing boar in the summer but nothing heavy. I drive 90% city 10% highway with a 250 lb topper and about 300 lbs of gear daily.

The 3.55 seems like a perfect balance and I can't decide if the 3.21 will seem gutless by comparison or if the 3.92 will get lousy gas mileage. I justified my purchase of a new truck in part with improved gas mileage. (my 02 Ram got about 11 mpg.)

Also wondering if the 3.92 is too snappy. I have to be gentle on the pedal now starting out (snaps my head back) and am concerned it will break loose easily on snowy Minnesota roads. But I like to stomp on it sometimes too.

Any opinions are welcome as I plan to place the order on Tue. I've read other threads but am still undecided.

Thanks,
Scott
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  #2  
Old 09-01-2013, 10:36 AM
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3.92. I personally would never consider 3.21

3.92 will not get lousy fuel economy compared to 3.55. Fuel economy is very subjective but I've always found lower geared vehicles to be more enjoyable to drive, without much (if any) penalty at the pump.

Don't go by what's listed on the website, double check with the dealer about your 3.55.

Edit: I re read your post, with 90% city driving you will definitely not get worse fuel economy with 3.92.
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Last edited by Swaggerville Ram; 09-01-2013 at 10:42 AM.
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Old 09-01-2013, 10:43 AM
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if it came with 3.55 no reason they cant put a new set of 3.55 in
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Old 09-01-2013, 10:45 AM
Scott H Scott H is offline
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Thanks. I put together the order sheet on Thur with sales manager. 3.55 was not available. Thinking on it over the weekend before confirming order on Tue. Was hoping with mostly city driving babying the 3.92 would get decent mileage.
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Old 09-01-2013, 10:46 AM
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Get the 3.92's, you won't regret it!
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Old 09-01-2013, 10:50 AM
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Quote:
Originally Posted by Scott H View Post
I have the 8 speed 3.55 and love it but 2014s only come in 3.21 or 3.92.

I tow a fishing boar in the summer but nothing heavy. I drive 90% city 10% highway with a 250 lb topper and about 300 lbs of gear daily.

The 3.55 seems like a perfect balance and I can't decide if the 3.21 will seem gutless by comparison or if the 3.92 will get lousy gas mileage.
If you had to face the same decision but with the six speed transmission what would you select? The eight speed with 3.21 has more off the line ability than the six speed with 3.92s.

As far as MPG I never had a change to figure that out but the math says this: At 1500 RPM, the 3.92s will move the truck along at about 56 MPH compared to almost 69 MPH with the 3.21 rear axle.

The weight you carry and tow is minimal but the type of driving you do really dictates your resulting MPG. In stop and go traffic, the rear axle ratio will have little impact on average MPG but will have a greater impact if your highway travels increase.

Since your travels are 90% city, go for the 3.92s, you will get a significant from dead stop launch will little impact on you average MPG. If you think your highway driving may change, go with the 3.21s.

I have the eight speed with 3.21s and tow up to 7700 pounds on occasion, it doesn't have an issue towing. Most of my driving is "non-stop and go" at speeds averaging 50 MPH and my average MPG is 21.7.
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Old 09-01-2013, 11:01 AM
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I ordered a 2014 Big Horn and it has 3.55s. Technically I ordered a SLT that included 3.21 but the Big Horn package included an upgrade to 3.55. I haven't taken delivery but I went to the dealer yesterday and checked it out. I got underneath and clearly saw the 3.55 on the sticker.

You can do a 2014 Build & Price to see, when I recreated what I ordered 3.55 is there and pre-selected. http://www.ramtrucks.com/hostc/bmo/CUT201413/models.do

Edit: I should say mine is a V6, that could be the difference, sorry if that confused things, the Hemi may not offer the 3.55.

Last edited by count2; 09-01-2013 at 11:10 AM.
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Old 09-01-2013, 11:12 AM
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I went with the 3.92 and really like it.....My buddy had the 3.55 and he isnt getting that better of gas mileage.....
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Old 09-01-2013, 11:27 AM
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I do mostly city driving and went 3.92's. Averaging right around 13.6 mpg. Also to note, it's pretty hilly where I live and that takes 1 or 2 mpg off the total i think. I also had an '11 5 speed with 3.55's and was only averaging 10mpg in the same terrain. THe off the line performance is worth going with the 3,92's IMO.
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Old 09-02-2013, 08:50 AM
kxlexus kxlexus is offline
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3.92 all the way. 3.21 gears don't belong in a truck.
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