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Old 12-02-2013, 12:20 PM   #1
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Gearbox

Hi

I am quite new to this forum so pardon me if i were to post it in the wrong section. My family recently just bought a JK wrangler. We sort of mod it by increasing its height and fitted larger tires and wheels. We then noticed that the pick up is not as good as before. I was wondering if we could change the gears in the gearbox to make the acceleration better.

On a side note, we also fixed a rear bumper and somehow the LED brake lights are spoilt. Is there any websites which sells the LED brake light?

Thanks

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Old 12-02-2013, 12:22 PM   #2
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Differential. Google or search "regearing" on the forum.

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Old 12-06-2013, 11:20 AM   #3
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I feel that the jeep can't achieve a high top speed which I desire after changing the tires. The bigger tires does fit in nicely onto the vehicle. Therefore is just that we had to change the fouth or fifth gear for better top speed?
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Old 12-06-2013, 12:21 PM   #4
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Why would you want to change the tranny gearing ?

What differential gears do you have currently. 321, 373, 410 ?

Gear sets cost around $500-$600 including master rebuild kits and bearings. Labor ranges anywhere from $400-$1000 depending on area and the shop doing the gears.

Your best bet is to gear the diffs lower which is commonly done when going with bigger tires,
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Old 12-06-2013, 03:49 PM   #5
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First thing. Did you get a programmer and re-calibrate the code for the stock tire size? Everything but the butt in seat is controlled by the CANBUS system.

Bob K.
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Old 12-06-2013, 04:21 PM   #6
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Quote:
Originally Posted by liren92 View Post
Hi
I feel that the jeep can't achieve a high top speed which I desire after changing the tires. The bigger tires does fit in nicely onto the vehicle. Therefore is just that we had to change the fouth or fifth gear for better top speed?
Even if different gearsets were available for the transmission, it would cost you a fortune to change them out and then you'll need to figure out how to reprogram the computer. Currently, there are no consumer products to reprogram the transmission in the JK. What you want is to regear your differentials.
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Old 12-06-2013, 04:41 PM   #7
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The computer controls the shifts. And has the stock tire size programmed into it. The transmission shifts, speedomoter, odometer, trip meter and MPG calculation are all based off code in the Computer. A programmer will modify the code. Same thing for TPMS. There is a factory setting, and then the programmer setting.


Bob K.

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