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post #1 of 6 Old 09-18-2011, 08:29 PM Thread Starter
040498bs
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Gearing Question??

I just regeared my '86 CJ7 from 2.73's to 3.73's with a trac-lock in the rear axle. My jeep has a factory automatic transmission in it. In the next few months I'm planning on a lift and bigger tires. I guess my question is, what's the biggest tire I can run with my current set up and how much lift will I need? It has a stock suspension now and will be used as a daily driver, with a few easy trail rides from time to time. I want to run as big a tire as I can while still maintaining the new found pep I just got from the regearing. Any and all suggestions are greatly appreciated.

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post #2 of 6 Old 09-18-2011, 08:52 PM
gojeepin
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Your 3.73s and auto trans will work nicely with 33s. Depending on the amount of off-roading and flex you want, a 2.5" to 4.0" lift will be fine.

Vibration? Bump steer? Wandering? Read the article (sticky) on Steering, suspension, and driveline.
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post #3 of 6 Old 09-18-2011, 09:08 PM Thread Starter
040498bs
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Thanks! I was hoping I would be able to go with 33s. I know with the 31s on there now, it's pushing some serious RPMS at 60-65mph. Any recommendations on which 4 inch lift to go with? The place that installed the gears wanted to sell me a Rough Counrty lift. I thought I had read somewhere on here that for the best ride I may want to stay away from there lift. When I asked them about this they said they used to be known for a rough ride, but the last few years their equipment had changed and the ride was better. Is that the case or were they just trying to push what they had in the shelf?
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post #4 of 6 Old 09-18-2011, 09:34 PM
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Rubicon express...most complete I've used...good ride for a leaf spring jeep.
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post #5 of 6 Old 09-18-2011, 09:36 PM
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BDS. http://bds-suspension.com/ Rides and flexes very nicely and has a no BS warranty.

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post #6 of 6 Old 09-19-2011, 05:31 AM
JeepHammer
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Quote:
Originally Posted by 040498bs View Post
I just regeared my '86 CJ7 from 2.73's to 3.73's with a trac-lock in the rear axle. My jeep has a factory automatic transmission in it. In the next few months I'm planning on a lift and bigger tires. I guess my question is, what's the biggest tire I can run with my current set up and how much lift will I need? It has a stock suspension now and will be used as a daily driver, with a few easy trail rides from time to time. I want to run as big a tire as I can while still maintaining the new found pep I just got from the regearing. Any and all suggestions are greatly appreciated.
Are you going for looks or off road capability?

For off road capability, you want to keep a REASONABLE size tire and you want to keep the center of gravity low.

The less lift you can get away with and still have tire clearance is what you should go with.
If you go above 2.5" or 3" of suspension lift, you will start having some steering problems you will need to correct, and that means time and money, plus the aggrivation of chasing those 'Issues' out of the vehicle.

As for tires, it's up to you, the taller you go, the more sluggish your vehice is going to seem, and the harder it's going to be to stop.
Since larger tires overleverage the brakes, the taller you go the harder the brakes have to work to stop you.

I would stick with about 33" Max limit unless you decide to kick the gears again and get rid of the factory Dana 30.
The Dana 30 is not real strong, and you usually start to break parts if you get above 33" tires.

Anyway, it's up to you, these are the 'Facts' and what most people find when they do what you are doing, so make your own choices and Happy Jeeping!
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