Loss of power in overdrive. - JeepForum.com
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post #1 of 10 Old 06-13-2021, 09:09 AM Thread Starter
maintman40
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Loss of power in overdrive.

4.0 Starts and runs good up thru the gears until 5th gear overdrive, then feels sluggish and won't pull itself.

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post #2 of 10 Old 06-13-2021, 09:29 AM
222Doc
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tires over sized?
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post #3 of 10 Old 06-13-2021, 03:48 PM Thread Starter
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31x10.5x15
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post #4 of 10 Old 06-13-2021, 04:16 PM
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So it's got larger than stock tires.
Have you re-geared the axles to compensate for that? If not, what you describe is normal and to be expected. Re-gear the axles if you want to get the power band back to normal.

'09 JK Rubicon
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post #5 of 10 Old 06-19-2021, 04:45 PM Thread Starter
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What's the best gear ratio for 31" tires with a 4.0 and a 5 speed? very little off road driving.
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post #6 of 10 Old 06-19-2021, 04:51 PM
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post #7 of 10 Old 06-20-2021, 07:43 AM
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The 2004 Rubicon came with 31 inch tires and 4.11 gears. You likely have 3.07 gears currently, you might have 3.73s, but if you did you likely would not be complaining.

I would do the 4.11 gears if it was me.

Jeff
2014 2 dr Rubicon
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post #8 of 10 Old 06-20-2021, 10:16 AM Thread Starter
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Thank you all. You have been a big help!
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post #9 of 10 Old 06-20-2021, 10:23 AM
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Quote:
Originally Posted by maintman40 View Post
What's the best gear ratio for 31" tires with a 4.0 and a 5 speed? very little off road driving.
That is a fallacy. gears have to do MORE with STREET. You have a low range that helps with wrong gears for tires size. Can't use that on the street.

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post #10 of 10 Old 06-24-2021, 10:30 PM
80cj
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How much power are you losing when in overdrive? Axle ratio, transmission and tire size are all tied together. I would expect a power loss in overdrive. Overdrive ratios turn the drive shaft faster than the engine crankshaft.
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