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regear help

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Old Feb 20, 2012 | 10:22 AM
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regear help

ok guys looking to upgrade tire to 37's.... in order to keep around the same MPG (i know im gonna lose a little) i know i need to regear the rear diff...
the truck is an every day driver....
2006 F250 4x4 Lariat super crew cab
what suggestions do yall have for me?
 
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Old Feb 20, 2012 | 10:29 AM
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Originally Posted by lee_faust2008
i know i need to regear the rear diff...

Gotta do the front diff too, although Im assuming you already new that.
 
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Old Feb 20, 2012 | 10:30 AM
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yea thats what i ment sorry.... i know i need to regear the entire truck just wondering what size gears would be best?
 
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Old Feb 20, 2012 | 10:34 AM
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Go to one of the online 4x4 places that sells tires. Usually they have a gear ratio guide on tire size. I think a lot go with 4.56.

Here's a link to a chart

http://www.4wheelparts.com/aux_incl/gear_ratio.html
 
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Old Feb 20, 2012 | 10:35 AM
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What engine you running?

Prob the best gear for 37" tires...is going to be the 4.56.


Hope this helps...


biz
 
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Old Feb 20, 2012 | 10:35 AM
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with 4.56 wont i lose top end power??
 
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Old Feb 20, 2012 | 10:36 AM
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6.0 powerstroke
 
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Old Feb 20, 2012 | 10:39 AM
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I've heard guys say the diesel's do well with higher gears (numerically lower), but I dont own a diesel so....
 
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Old Feb 20, 2012 | 10:40 AM
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I attached a link to my earlier post on gear ratio selection. check it out.
 
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Old Feb 20, 2012 | 10:41 AM
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i was told to look into 4.10's but im just not sure i dont know much about gearing just wanted to get some input from you guys in order to have a better outlook on this topic to make the best decision possible
 
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Old Feb 20, 2012 | 10:43 AM
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Hopefully a diesel guy can chime in who has a similar configuration.
 
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Old Feb 20, 2012 | 10:43 AM
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If you are running 3.73, then 4.30 would due well. Try this Calculator...

Calculators


biz
 
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Old Feb 20, 2012 | 10:51 AM
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thats just it im not sure what im running right now... all i know its factory stock im trying to figure out what i got but im having some trouble
 
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Old Feb 20, 2012 | 10:54 AM
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Originally Posted by lee_faust2008
thats just it im not sure what im running right now... all i know its factory stock im trying to figure out what i got but im having some trouble
No tag on the rear diff? Also check out the SuperDuty tech folder at the top of the threads. I think there is something there to tell what you have by the tag on the door.
 
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Old Feb 20, 2012 | 10:56 AM
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im deployed right now so i cant phisically look at anything on the truck just doing research for when i get back getting ready to do alot of MODs
 
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