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post #1 of (permalink) Old 02-06-2007, 05:25 PM
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regearing?

Hello, I'm new to the sight so just wanted to introduce myself first. Live in sw colorado, have stock 86 cj7 that i am about to put a 4 inch pro comp lift on, with 2 inch body lift. I have 35 inch tires on standby. My question is how much will the larger tires affect the daily driving operation of the vehicle. Do i need to regear it so that my actuall speed is really what my speedometer reads? I guess I'm just confused about all this talk about re gearing and what it's for. I understand wanting to crawl in my low range, but how does it affect my regualr high range? I don't mean to sound ignorant, i'm just trying to learn, Thank you in advance, Brian.

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post #2 of (permalink) Old 02-06-2007, 05:37 PM
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Re: regearing?

Sorry Man, but search, this has been covered many times before, especially with 35s! If you still need help, tell us what tranny, transfer case, and gears on your axles you already have (covered too) we can then help you better.
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post #3 of (permalink) Old 02-06-2007, 06:11 PM
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Re: regearing?

Welcome....
So...how are your kidneys? That pro-comp lift is most likely beating you up pretty good.

As Thor said...do a search....you will get much more info that way....

Bottom line...35"'s? there is a lot more involved than just gears....

BTW...loose the body lift....it does nothing for ground clearance....
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post #4 of (permalink) Old 02-06-2007, 06:54 PM
 
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Re: regearing?

As you increase the diameter of the tire, it increases the leverage against drivetrain works to propel the vehicle. Imagine if I took away your first gear, when you tried to pull away from a stop you would find the vehicle resisted it more than ever. You would have to give it more gas, slip the clutch more, and it would pull away much slower. That is what bigger tires do to you. Every gear will now seem higher, and rpms will be lower than they were before at a given speed in that gear. 5th gear, if you have it, may be unusable. Now if you compensate by putting in a higher numerical gear set in both axles you can compensate for the loss in torque at the wheel. This will fix that problem, but you still have more torque on the axles themselves, and they will break easier.

As for speedometer compensation, that is a small gear in the transfer case or transmission that spins the speedometer shaft. If you put on different size tires, such as larger tires, your wheels turn less revolutions per mile, and you need a different gear to compensate to make the speedo accurate. That is cheap and easy to do. The regearing of the axles is more involved and expensive, but worth it.
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