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Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

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do I need to regear?

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Old Nov 28, 2007 | 11:38 AM
  #21  
rubiconjack's Avatar
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okay ..

yeah I have 3.73s for sure .. we checked with jeep today.
So my mechanic is gonna see what he can do for prices ..
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Old Nov 28, 2007 | 05:00 PM
  #22  
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From: Oak Harbor, WA
Default Re-gearing

It's a hefty price to re-gear. I would drive it first and see what you think before jumping in and paying. If you like how your Jeep drives now then your going to want to re-gear. It isn't mentioned a lot but if you start adding steel bumpers and a winch that also sucks the performance out of your ride. Here is some math equations to help you out.

Old Tire size / New Tire Size x Original Ratio = New Effective Gear Ratio

For instance I have

32 / 35 x 4.10 = 3.74. If I wanted CLOSE to stock performance I would go with 4.88. (I have a Manual)
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Old Nov 29, 2007 | 05:40 PM
  #23  
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Unfortunately, when I found the JK that had every option on it that I wanted, I realized that it had the 3.21 gears instead of the 4.10s. I went ahead and bought it figuring that I could change them easier than I could spend more months looking for the exact JK that I wanted.

I have since added the lift and the 35s and I must say that I have been pleasantly surprised. Obviously I won't be outrunning any sports cars between red lights but for around town and short trip driving it is perfectly acceptable.

I did take one 650 mile round trip soon after adding the tires and for interstate driving purposes I have essentially lost 6th gear. But, I could still maintain 75-80 in fifth and did so at a little under 2500 RPM. IMO, unless you will do A LOT of interstate driving or just really plan on giving it HELL off road, I think the gears are overkill and a waste of money.
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Old Nov 29, 2007 | 07:56 PM
  #24  
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okay ... yeah. I am not doing it yet. I am waiting on it to see how it drives on road and off, wet and dry .. every condition or cloes to it before I make my decision. Yes I know its alot .. and I have already dropped a lot into my JK .. and I still don't have my bumpers yet .. thats all I am adding ...
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Old Dec 15, 2007 | 03:34 PM
  #25  
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so right now .. the gears are still stock! OMG

IT SUCKS ... driving anywhere .... ahhh

I can't accelerate, I go up to 2500- 2800 RPM before I can switch gears ... and I can only go to 4th .. sometimes 5th on the freeway .. but thats only if I want to do 50 mph ... in a 60

so 5.13's or 4.88s. I want to get 37's when it hits summer and i can get into rockcrawling
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Old Dec 15, 2007 | 03:38 PM
  #26  
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5.13's if your planning on 37's
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Old Dec 15, 2007 | 06:13 PM
  #27  
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From: chandler, az
Default 5.13's for 37's

I just got my 5.13's and locker in the rear w/37". It did help quite a bit and the crawl ratio is going to be great. I do have to break them in for about 500 miles or so. I am very happy though........I do notice that with a 6speed first gear is really low now. I can even start out in 2nd if need be........
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Old Dec 15, 2007 | 06:22 PM
  #28  
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Originally Posted by 2drnsonoran
I just got my 5.13's and locker in the rear w/37". It did help quite a bit and the crawl ratio is going to be great. I do have to break them in for about 500 miles or so. I am very happy though........I do notice that with a 6speed first gear is really low now. I can even start out in 2nd if need be........
is there THAT big a difference between 4.88s and 5.13s, along with price too? I know my moms 03 TJ 'sport' I can start out in 2nd ... its nice ... I would love it on my JK ... long way from there though!
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