Regear Speed change - JeepForum.com
 
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post #1 of 4 Old 01-08-2009, 01:54 PM Thread Starter
towerassoc
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Regear Speed change

I have a 2008 X with 44 rear and 30 front, 285/70/17 tires, 2.5 BB and 3.73 gears, Auto.
I would like to regear to 5.13 but would like to know what the speed o meter change would be around 60 miles per hour.
I searched for a chart but could not find one.

Tanks
Bill

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post #2 of 4 Old 01-08-2009, 02:39 PM
tricked919
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Quote:
Originally Posted by towerassoc View Post
I have a 2008 X with 44 rear and 30 front, 285/70/17 tires, 2.5 BB and 3.73 gears, Auto.
I would like to regear to 5.13 but would like to know what the speed o meter change would be around 60 miles per hour.
I searched for a chart but could not find one.

Tanks
Bill
wow - 5.13's for 285/70's ?? Isn't that smaller than a 33 ??

As far as answering you question, I believe the change is strictly based on the change in tire size because the speed pick up is tied in with the ABS wheel sensors. Dealer can calibrate that up to 32" I think, but I've never heard of a speedo change with gears.
Someone will correct me - I'm sure.
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post #3 of 4 Old 01-08-2009, 02:41 PM
Prot
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That's 32.7" diameter. That's not much bigger than stock.

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post #4 of 4 Old 01-08-2009, 03:31 PM
08BlueSahara
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Quote:
Originally Posted by Prot View Post
That's 32.7" diameter
So, you'll either need to have the dealer program it to 32" (and still be slightly off), or use an aftermarket programmer like:

https://www.jeepforum.com/forum/showt...eedo+reprogram

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