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Yoshiltz 07-09-2012 04:12 PM

need a link please
OK, what I have is an 01 TJ, 4.0, 3sp auto sitting on 32-11.5's, 8" wheels with the stock axles and gears. I may or may not upgrade the axles. I don't do any hardcore offroading just an occasional trail ride so I may just wait till I have a failure before I replace 'em. What I'm interested in for the time being is re-gearing what I have now because its a total dog on the street. I expect to stay with 32-33" tires for the life of my Jeep. Can someone post a link or some info for the recommended gearing.

stritt45 07-09-2012 04:55 PM

Go with 4.10s......

jefferyfghezzi 07-09-2012 05:24 PM

Hope this works

Crawl Ratio
P-Metric to Inch Diameter
Tire Change (find new gear ratio)
Speedometer Adjuster (with oversize tires)
(New Tire Diameter / Old Tire Diameter) * Speedometer MPH = Actual MPH Simple Gear Ratio Formula
Ring Gear Teeth Count / Pinion Gear Teeth = Gear Ratio

jefferyfghezzi 07-09-2012 05:28 PM

Gear Ratio & Tire Size Chart

Good "rule of thumb" calculation is to mutiply .12 by your tire diameter. (.12 X 38" = 4.56)
(see more formulas at bottom of page)
The below table can be used to get a rough idea on gear ratios. The colors represent ideal RPM's at highway speeds (65). For highway cruising and best fuel economy stay towards the yellow (2600 rpm), around town daily driving is color coded green (2800 rpm), and for better towing power or just more 4-low power use the ratios near the red (3100 rpm). These calculations are assuming a manual transmission with a 1:1 ratio. If you drive an automatic your RPMs will be slightly higher, and the opposite is true if you have overdrive (your RPMs will be slightly lower).

Better Gas Mileage Near Factory Ratio More Power
Gear RatioT

3.313.423.553.733.914.114.274.564.885.135.295.385.716.177.1727"26772766287230173163332534543689394741504279435246 194991580028"25822668276929093050320633313557380640014126419644 544813559329"24932576267428092945309532163434367538633984405243 004647540030"24102490258427152846299231093320355337353851391741 574492522031"23322409250126282755289630083213383836143727379040 234347505132"22592334242325462696280529143112333135013610367238 974211489433"21912263234924692588272028263018323033953501356137 794093474534"21262197228023962512264027432929313532953398345636 683963460635"20652134221523282440256526642845304532013301335735 633850447436"20082075215422632372249325902766296131123209326434 643743435037"19542019209522032308242625202692288130283123317633 703642424338"19021966204021442247236224542621280529483040309232 823546412139"18541915198820892190230223912554273328732962301331 983455401540"18071867193820372135224423312490266428012888293731 183369391541"17631822189119872083218922752429259927332818286630 423287381942"17211778184619402033213722202371253826682751279829 693208372843"16811737180318941986208721692316247926062687273329 003134364244"16431698176218511941204021192263242225462626267028 3430633559Common gear formulas:

jefferyfghezzi 07-09-2012 05:29 PM


Yoshiltz 07-11-2012 06:24 AM

Yeah um......

jefferyfghezzi 07-11-2012 06:43 AM


Originally Posted by jefferyfghezzi (Post 2563319)

Yoshiltz 07-11-2012 07:12 AM

Thanks, I will definitely be referring to that from time to time. Now all I gotta do is drop that nasty body lift and add a touch of susp.

toms01TJ 07-11-2012 12:16 PM


Originally Posted by Yoshiltz (Post 2569362)
Thanks, I will definitely be referring to that from time to time. Now all I gotta do is drop that nasty body lift and add a touch of susp.

Another link.

Gear Ratio Calculator

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