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  #1  
Old 11-23-2010, 09:52 PM
deerslayer1521 deerslayer1521 is offline
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Default 4.56 gears..?

anybody got a clue wut kind of gas milage a 4.7 4x4 would get with 4.56 gears??
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Old 11-23-2010, 09:55 PM
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Depends....

Tire size?

In town only?

Highway?

On the highway....not great.

In town, likely a tad better due to less resistance pulling out. (or in a hilly area)
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Old 11-24-2010, 02:09 AM
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add driving style to that as well. 4.56s would be good if you're running larger oversized tires (37+), but if you're not, you probably wouldnt get the best mileage, but you'd have great torque
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Old 11-24-2010, 02:42 PM
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Quote:
Originally Posted by OldMoparMan63 View Post
Depends....

Tire size?

In town only?

Highway?

On the highway....not great.

In town, likely a tad better due to less resistance pulling out. (or in a hilly area)
Yup, I agree with OldMo. In town/hills you'd probably do better, on the highway, you'd definately loose a bit, unless you actually drive 55, then it may not make too much difference.
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Old 11-24-2010, 03:08 PM
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What do you expect to gain with 4.56's that 4.10's won't give you? The 4.7 gets poor mpg on a stock truck all by itself.
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Old 11-27-2010, 12:51 AM
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I have a reg cab 4x4 with 4.56 gears with 285/17s I average around 15 to 16 mpg on the hwy Is that good for my truck
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Old 11-27-2010, 03:10 AM
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w/ the 3.92s in a reg cab 4x4 4.7 I get about 18hwy if I baby it a little but im usually only around 16.5-17 imho only losing 1 or 2 mpgs would be worth the 4.56 ima prob switch over some day after some other mods
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Old 11-28-2010, 12:50 AM
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If you put bigger tires on your truck it actually lowers your gear ratio. So the bigger tires you put the more you affect your ratio. So when you throw on a higher gear ratio you will bring it back to "stock". If you dont have bigger tires the higher gear ratio will probably take some MPG away from you. I dont think it will be like 5MPG or anything, maybe 1-2MPG. You acceleration will be much better, thats for sure.
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Old 12-01-2010, 11:37 AM
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thats wut i thought.. my truck has the 3.92 in it now and if i baby it gets 17 on a good day.. just wasnt sure how bad the drop would be.. im bout to rebuild the engine and thought bout rebuildin the axles while im at it. thanks again for the help
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Old 12-01-2010, 02:47 PM
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If you are going 70+ then you may get a loss in MPG. Getting up to speed though will be more sufficient and less strain on the motor.
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