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Gears for 31" or 32" tires


 
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330T
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Joined: 29 Sep 2006

PostPosted: Thu Oct 05, 2006 10:31 am    Post subject: Gears for 31" or 32" tires Reply with quote

Thinking of going with 31 or 32" tires but i'd like to keep the TJ a daily driver. what gears provide the best day to day fuel economy?
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IBTJn
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Joined: 31 Dec 2004
Location: Just Outside of Portland, OR

PostPosted: Thu Oct 05, 2006 12:03 pm    Post subject: Reply with quote

With what tranny?
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330T
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Joined: 29 Sep 2006

PostPosted: Thu Oct 05, 2006 12:08 pm    Post subject: Reply with quote

IBTJn wrote:
With what tranny?


42RLE auto, sorry
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Thu Oct 05, 2006 1:52 pm    Post subject: Reply with quote

Those aren't too much bigger and you'll probably be fine without a gear change.
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IBTJn
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Joined: 31 Dec 2004
Location: Just Outside of Portland, OR

PostPosted: Thu Oct 05, 2006 2:43 pm    Post subject: Reply with quote

ehirner wrote:
Those aren't too much bigger and you'll probably be fine without a gear change.

I agree. Wink
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330T
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Joined: 29 Sep 2006

PostPosted: Thu Oct 05, 2006 3:32 pm    Post subject: Reply with quote

cool thanks
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89JeepXJ
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Joined: 14 Jan 2007
Location: Spring Lake Michigan

PostPosted: Tue Jan 23, 2007 7:35 pm    Post subject: Reply with quote

in regards to the last post on this thread...i have an 89 cherokee, aw4 automatic, 4.0 I6 and i have 32" tires and i believe 3.55's...its a real dog on the highway....just wondering if a gear swap would help this and if so what gears?? appreciate any input!
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Tue Jan 23, 2007 9:04 pm    Post subject: Reply with quote

http://www.californiajeeper.com/crawl-ratio.htm

A good link for figuring tire size-to-gear ratios.
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89JeepXJ
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Joined: 14 Jan 2007
Location: Spring Lake Michigan

PostPosted: Wed Jan 24, 2007 12:56 pm    Post subject: Reply with quote

i didnt see an option on that graph for an XJ 6 cyl...or for the aw4 trans...does anybody have an xj automatic 4.0 w/bigger tires...what gears do you have??
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Wed Jan 24, 2007 4:29 pm    Post subject: Reply with quote

i have an 87 with 33s maybe a tad bigger with the 3.54 gears, it could stand being regeared to 4.10s
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Ptown_bogger
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PostPosted: Tue Feb 27, 2007 4:04 pm    Post subject: Reply with quote

4.56 gears and 245/75/16 Rubicon Moab wheels and MTR tires. Freaken love the gearing! High RPM's on the freeway but im not scared, the 285/75/16 im getting should come be going on in a few months. dont be afraid to regear low, your tranny will love you for it
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Orangeamc13
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Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Tue Feb 27, 2007 4:25 pm    Post subject: Reply with quote

http://jeephorizons.com/tech/rpmchart.html
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