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Old 09-05-2014, 06:31 AM   #1
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Cant keep rpms in 6th gear

Have a 05 2.4 with six speed pushing 33 x 12.5 tires and can't get enough rpms to use 6th gear there a way to fix my problem such as re-gearing the axles or is it just a case of not enough balls for the size of the tires ?

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Old 09-05-2014, 06:39 AM   #2
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2010 JK, Red Rock Crystal, 6 speed manual, Ripp supercharger, 4.56 gears, OX lockers with electric actuators, Rugged Ridge XHD front and rear bumpers, Warn M5000 winch, Rugged Ridge Side Armor Guards, Rugged Ridge Front Skid Plate, Rugged Ridge Evaporator Skid Plate, M.O.R.E. Oil Pan & Transmission Skid Plate
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Old 09-05-2014, 11:02 AM   #3
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Yes a re-gear is your only option... Although my 06 2.4L had the same issue where 6th gear was useless with stock size tires...
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Old 09-05-2014, 06:19 PM   #4
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Thanks for the response on that any thoughts on what gear ratio would be the right one to go with
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Old 09-05-2014, 06:23 PM   #5

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there has been a lot of discussion the last few days about this.....FWIW I have 4.88s....came from 3.73s....have heard some are "Happy" with 4.10s and a lot of people say the 4.56 is enough.....however being the 4cyl instead of the 6cyl you MIGHT need 5.13s look around, one of the threads had a couple different gear/ motor/ tire charts...
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Old 09-05-2014, 06:32 PM   #6
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4.88's if you have a dana 30 front. 5.13's if you have a 44 up front.
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Old 09-05-2014, 08:26 PM   #7
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as above, 4.88 will be what you want (this is the max you can do) dont have a d44 up front unless you've replaced it with something else and that does not include just doing chromoly shafts up front
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Old 09-06-2014, 05:27 AM   #8
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I have a 2.4 with a 5 speed and factory 4:10's. I use 5th on flat and downhills and just run in 4th which is 1:1 and 5th is overdrive. If you have the money to regear go for it, I was downsized over 2.5 years ago and do not and find not having overdrive most of the time is perfectly fine.

Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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