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Old 07-07-2013, 07:41 PM   #1
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35" BFG KM2 & Shutting OD off

I put 35" BFG KM2 tires on my 2008 Rubi along with a 3" Rough Country lift. I really like the set up and have noticed a slight difference in "power" when running 55-65 mph. I'm considering a performance tuner but when I turn off my overdrive, the RPMs increase and the Jeep stays in 3rd longer thus providing better power at higher speeds. Beside a decrease in fuel economy, are there any long term problems that can be created by driving consistently with OD shut off? Thanks!

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Old 07-07-2013, 07:59 PM   #2
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Nope. Fwiw I've been running Superchips 93 tune for over a year.

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Old 07-07-2013, 08:26 PM   #3
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Well I've got nothing.
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Old 07-08-2013, 01:39 AM   #4
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I'd still pick up a tuner/ProCal to correct the speedo and input your gear ratio for shift points. 2010 JKUR, 4:10s, 35" Nitto Trail Grapplers for the past year and it's been okay, luckily I live in a flat city. OD goes off the second I start up the Jeep, it's only usable going downhill, lol.
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Old 07-11-2013, 05:59 PM   #5
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Thanks for the replies everyone. Planning on a tuner for sure but is sounds like shutting off the OD is a feasible short-term solution to improve the performance.
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Old 07-11-2013, 06:08 PM   #6
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I used to run with OD off, until I went 5.13. Do yourself a favor, install 5.13's

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Old 07-11-2013, 06:24 PM   #7
yeah,,,, im that good

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I would think that the only downfall is that you have a 3 speed automatic. When I was a kid, my dad had an AMC Gremlin...with a 3 speed stick.

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