'97 4 banger with 31s and 2.5" lift.. regear necessary? - Jeep Wrangler Forum
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Old 01-19-2013, 01:29 PM   #1
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'97 4 banger with 31s and 2.5" lift.. regear necessary?

Hi all, I'm in the process of saving up the funds for a set of 31" Treadwright Guard Dogs and a 2.5" Suspension lift and Rancho shocks. I'm wondering if a regear to 4.56 is a good idea after all this is installed?

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Old 01-19-2013, 01:35 PM   #2
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If it has 4:10's already then that's a lot of money for a small upgrade. I run 31 10.5's with 4:10's on an 04. 2.4L and it is fine for an everyday DD.

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Old 01-19-2013, 03:31 PM   #3
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Mine was a dog on 31's with 4:10 gearing, and stock 2.5L, so I switched to 30" tires and have a pro-comp 2" lift. The 2.4l has more horsepower from the factory as well. I would rather have my 2.5 l motor though, personally, no offense. You will have driveshaft vibrations that only a slip yoke eliminator kit can positively remove from what I have gathered, and it is more money than I can part with, like $700.00. I use the transmission skid plate lowering kit, and still have some vibrations. Mine is a daily driver though, and I live in a mountainous/hilly area. In places like Kansas, or flatlands, Jeeps may not have such a difficult time with 31's, and stock gearing.

Not to brag, but since I couldn't afford the re-gearing of both axles, I nickle and dimed a banks torque tube header, flowmaster muffler, rock -it intake, power-aid throttle body spacer, and a K&N filter which gave me noticeable power, but maybe not enough to run 31's without power problems. I have yet to try any larger size tires since I added the performance modifications though.
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Old 01-19-2013, 04:31 PM   #4
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You don't need a SYE for such a small lift. Worst case is you can put a few thick washers between the skid plate and frame
As far as your expecting set-up, you will be fine. Im running 32's on a 3" BB lift with JK shocks. It's never gonna be a speedster anyways.
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Old 01-19-2013, 04:37 PM   #5
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my 97 2.5 has 31s now, its fine with stock gears. for me anyway. the amount of money you'd spend to regard isn't really worth it. and ive got a 2.5" suspension lift. if you want to go much bigger you'll need to regear, but 31s your fine.
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Old 01-19-2013, 05:22 PM   #6
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Quote:
Originally Posted by Ohio79 View Post
You don't need a SYE for such a small lift. Worst case is you can put a few thick washers between the skid plate and frame
As far as your expecting set-up, you will be fine. Im running 32's on a 3" BB lift with JK shocks. It's never gonna be a speedster anyways.
The washers make up the lowering kit , yes. As far as damaging vibrations, I have probably put 70,000 miles on it since the lift was installed, and have not damaged any of my driveline. Knock on wood.
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Old 01-19-2013, 05:30 PM   #7
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I have the 4 banger and an Old Man Emu 2.5 HD lift running 32x11.5x15 goodyear kevlar wranglers. Live in Kansas and it gets by, but it's not overpowered by any means. Trailered it to ouray, co last summer and it does great on the trails, struggled on the highway up the mountains. Around here it's longest trip is 20 miles one way so I don't worry about it too much. It's mostly a nice weather, lake jeep for me.

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