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Old 09-21-2012, 12:22 PM   #1
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Regear Question

Here's my current setup:

2006 SE
4.0L engine
3.25 RC Lift
33 Wrangler Duratracs

This is my DD and I do minor offroading. I have noticed loss of power after adding the tires. What would be the best gear to change to?

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Old 09-21-2012, 12:26 PM   #2
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Need to know manual or auto.

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2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, Truck Lite headlights, Homemade sunrider top.
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Old 09-21-2012, 01:14 PM   #3
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Auto
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Old 09-21-2012, 01:16 PM   #4
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Go right to 4.88 for 33" tires and your 4-speed 42RLE transmission. Yes I know 4.88 may sound too low for 33" tires but trust me, it's the right ratio for your particular transmission. The higher 4.56 ratio is often recommended for 33" tires but that is only a good choice for the manual transmission.
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Old 09-21-2012, 02:46 PM   #5
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4.88's for sure. Regearing twice really stinks. I know because I went with 4.56's and then right after realized I needed 4.88's. I ended up with 5.13's in case I move up to 37's. Huge waste of money re gearing again....
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Old 09-21-2012, 02:50 PM   #6
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Hey jerry I got a 4.0L 2002 3 sp auto should I get 4.10 for 33's that's what I was thinkin on gettin I didn't wanna go to low?
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Old 09-21-2012, 03:32 PM   #7
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Hey jerry I got a 4.0L 2002 3 sp auto should I get 4.10 for 33's that's what I was thinkin on gettin I didn't wanna go to low?
You're right on, 4.10 is ideal for your combination.
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Old 09-21-2012, 06:05 PM   #8
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Thanks jerry, once again you're the all knowin man on jeeps
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Old 09-21-2012, 06:09 PM   #9
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Quote:
Originally Posted by Jerry Bransford
You're right on, 4.10 is ideal for your combination.
Jerry I have the 4.0 5 speed with 33s. Right now I have 3.73. I plan on eventually going to 35s. I was thinking 4.56 for 35s. Should I go lower or will that combo work?
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Old 09-21-2012, 07:48 PM   #10
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Jerry I have the 4.0 5 speed with 33s. Right now I have 3.73. I plan on eventually going to 35s. I was thinking 4.56 for 35s. Should I go lower or will that combo work?
4.88 is ideal for 35" tires, 5-speed, and 4.0L engine. I ran that combination for years and it was ideal for the highway and superb offroad.
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Old 09-21-2012, 07:50 PM   #11
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Originally Posted by Jerry Bransford
4.88 is ideal for 35" tires, 5-speed, and 4.0L engine. I ran that combination for years and it was ideal for the highway and superb offroad.
Thanks Jerry.
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Old 09-26-2012, 11:59 AM   #12
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Ok. Another noob question. Will regarding negatively affect the mpg or speed of vehicle? I don't want to only be able to drive 45 mph.
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Old 09-26-2012, 12:06 PM   #13
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Ok. Another noob question. Will regarding negatively affect the mpg or speed of vehicle? I don't want to only be able to drive 45 mph.
The whole purpose of regearing is to prevent those problems from happening, or to cure them if they are already happening. Regearing puts the engine RPMs back to where they should be which allows it to operate most efficiently for more power and best possible mpg. Lower RPMs does not necessarily produce better mpg either. In fact, raising the engine RPMs back up to where they should be via a new lower axle ratio to compensate for larger tires will usually help improve the mpg. Not to mention restoring the power via lower ratio axle gears which otherwise might cause your top speed to be severely limited... like to your 45 mph example.
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Old 09-26-2012, 12:19 PM   #14
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Thanks

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