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Old 03-30-2016, 12:26 PM
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Regear 4.0 auto?

I have a 1997 TJ 4.0 Auto with Dana 44 rear and Dana 30 front with stock 3.55 gears. I am running 33" tires.

This is not my daily driver, but does see some time on the highway, around town, and off road.

I'm planning on regearing it because on the highway it revs to about 3200 rpm at 75mph. I'm thinking 4.56 would be the best from my research, but could use some advice.

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Old 03-30-2016, 12:32 PM   #2
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Old 03-30-2016, 01:22 PM   #3
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For your 3-speed automatic, 4.0L engine, and 33" tires, you want 4.10 gearing. Which transmission you have plays a key role in selecting the right ratio, gearing charts seldom produce good recommendations because they don't take the transmission type into account.
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Old 03-30-2016, 02:22 PM
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I need to look into this a little more as I might have something else going on. If I have 3.55's and install 4.10's or 4.56's, wouldn't that raise my rpm on the highway?

I'm going to do the driveway check by spinning the tire and counting driveshaft rotations to see if I can narrow down what is in there.
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Old 03-30-2016, 02:36 PM   #5
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Of course going from 3.55 to 4.10 or 4.56 will raise your rpms, that is the sole reason for and whole point of regearing the axles. Larger tires lower the rpms at the same driving speed so the engine no longer produces as much power. Regearing restores the rpms back up to where they need to be to be able to turn the larger tires. Installing big tires without regearing the axles to get the engine rpms back up to where they need to be will cause a serious loss of power by lugging the engine.

And in 1997, 3.55 was indeed the axle ratio that came standard with the optional Dana 44 axle.
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Old 03-30-2016, 03:09 PM   #6
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My 3 speed with 4.10/4.11 pretty much screams down the highway, and the highway I drive on is 70 mph which makes for a high RPM ride. The extra power, though, is well worth it, because I can get out of my own way now. I can see how the highway driving would be annoying, but for me, highway driving does not happen that often.
Right now my 31" tires make it worse, but when I get 33" put on, it should bring it back to a more optimum level.
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Old 03-31-2016, 02:45 PM   #7
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You should not be turning 3200rpm with 33" tires and a 3.55 ratio. You sure the gears are stock?
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Old 03-31-2016, 02:50 PM   #8
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Quote:
Originally Posted by lecharbon View Post
My 3 speed with 4.10/4.11 pretty much screams down the highway, and the highway I drive on is 70 mph which makes for a high RPM ride. The extra power, though, is well worth it, because I can get out of my own way now. I can see how the highway driving would be annoying, but for me, highway driving does not happen that often.
Right now my 31" tires make it worse, but when I get 33" put on, it should bring it back to a more optimum level.
33's with 4.10 will be optimal with your 3-speed automatic, that's a nice combination.

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