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Old 06-19-2010, 01:18 PM   #1
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regearing questions

Hey does regearing make your mpg go up down or prettyy much stay the same? (from 3.XX to 4.XX) I mean youre going to run more rpmīs but then again if you get bigger tires thats gunna mean a longer distance for 1 turn.

Help a confused guy out!

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Old 06-19-2010, 01:26 PM   #2
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Check out this chart to give you some idea.

Jeep Wrangler Gear Ratio Guide

Keep in mind though - too high a gearing (lower numerically) can cause lugging which is not only bad for the engine, but does not necessarily increase mileage just because you RPMs are lower. I'm pretty sure that ideally you want to be somewhere in the middle for best performance/MPG compromise.

For example - my Wrangler came with 30" tires and 3.73 ratio. To get back to that factory set up with my 33s, I need 4.10s. 4.56 would give me slightly less MPG, but also a little more oomph.

Then again, what the heck do I know?

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Old 06-19-2010, 01:33 PM   #3
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Also - if you have an automatic or five speed you would probably want to go with a lower (numerically higher) ratio than you would with a 6 speed manual.
For example in my case I have a 6 speed, so 4.10 is good. If I had a 5 speed or auto I would go with 4.56 with 33s for sure.
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Old 06-19-2010, 04:55 PM   #4
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It can do both. As a general rule, don't count on it. It's more of a power thing.
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