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Old 08-05-2010, 05:24 PM   #1
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4.10 or 4.56?

i have 6 cyl tj with 32.x10.50s. would it be better to go with 4.56 or 4.10s for the regear?

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Old 08-05-2010, 05:26 PM   #2
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What transmission do you have? What type of offroading do you do? Do you ever plan to go to 33" or bigger tires?

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Old 08-05-2010, 05:28 PM   #3
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I'm running a 4 banger with stock 4.10's and 32x11.50x15 with the added power of the 4.0 you shouldn't have to go further.
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Old 08-05-2010, 05:30 PM   #4
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Manual trans
mudding/trail and heavy snow.
and no, these tires are new and i plan on keeping em for a while
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Old 08-05-2010, 05:48 PM   #5
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Tire & Gear Ratio Chart at Morris 4x4 Center

I'm having trouble deciding but I'm pretty sure 4.56 is where I'm going with 33's now and 35's in the future.

Randy's Ring and Pinion doesn't carry 4.27 for the d30, anybody know why?
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Old 08-05-2010, 06:11 PM   #6
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Quote:
Originally Posted by chrism299 View Post
Manual trans
mudding/trail and heavy snow.
and no, these tires are new and i plan on keeping em for a while
Well, unless you're currently running 3.07 gearing, I wouldn't regear for just 32" tires. For 33" I'd go to 4.56 with the 4.0L and 5-speed but I don't think it's worth the $1100-1200 it costs to regear for tire sizes smaller than 33".

Do be very wary of making a gear ratio decision based on gear ratio charts like was provided above. They don't show your engine rpms when you are in 5th gear (overdrive). They instead show the rpms when your transmission is in its 1:1 gear ratio which would be 4th gear for you. Take such charts with a grain of salt combined with someone's solid experienced advice on an appropriate ratio. And the appropriate ratio depends primarily on two things... the tire size and equally important, the type of transmission in use.
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Old 08-05-2010, 08:11 PM   #7
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thanks

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