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4:56 Gears

Old 03-06-2019, 08:41 PM
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Default 4:56 Gears

I just ordered 4:56 gears for front and rear axle. I plan to run 33x12.50 tires and wondering who else runs this set up and also what rpms you are getting with auto tranny (AW-4).

I would also like to hear from those running 35s. Thanx!

Last edited by X1997J; 03-06-2019 at 08:43 PM.
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Old 03-06-2019, 10:07 PM
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My 2001 has 4.56 gears and 10.50 X 33-15 KO2s.
At 60 MPH, reading off the GPS, it's turning 2300 RPM, read with a ScanGuage. This is similar to stock gearing.
Due to the extra weight, it didn't feel that fast, It would be interesting to run 4.88s with the 33"s. With the 4.56s, it was a lot of fun to drive when it still had 31"s.
It's more interesting to drive now, with a little help from Russ Pottenger .
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Old 03-06-2019, 10:41 PM
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Use this to find out your what your rpms will be, http://www.grimmjeeper.com/gears.html or use the formula and do the math yourself.
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Old 03-07-2019, 07:50 AM
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Originally Posted by lazyxj View Post
My 2001 has 4.56 gears and 10.50 X 33-15 KO2s.
At 60 MPH, reading off the GPS, it's turning 2300 RPM, read with a ScanGuage. This is similar to stock gearing.
Due to the extra weight, it didn't feel that fast, It would be interesting to run 4.88s with the 33"s. With the 4.56s, it was a lot of fun to drive when it still had 31"s.
It's more interesting to drive now, with a little help from Russ Pottenger .

Stock gearing & tire size would be 1900-2000 @ 60 mph......
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Old 03-07-2019, 08:24 AM
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I've had 4.56 with 31s, 33s, and now I'm on 35s. I don't remember exact rpms, but it did fine on the highway with all of the tire sizes above. My 4.0 seems a little tired though so it would probably do even better with a strong motor.
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Old 03-07-2019, 11:25 AM
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Thanx for the replies. I have stock gearing now with 31s and I'm getting about 2100 rpm at 60mph. I'm just curious to see what the rpms will actually be with the new setup.
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Old 03-07-2019, 11:35 AM
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Have you changed your speedometer gear for the larger tires? With 31s and 3.55s, at 2100 rpm you would be going faster than 60 mph with 31s.
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Old 03-07-2019, 11:38 AM
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Originally Posted by X1997J View Post
Thanx for the replies. I have stock gearing now with 31s and I'm getting about 2100 rpm at 60mph. I'm just curious to see what the rpms will actually be with the new setup.

Have you checked you speed vs gps ? or mile markers on the highway ??

I ask, cuz I found out my speedo was off by a lot from the factory....enough so, that with stock gears and 31's, it is only off by ~2 mph @ 60 on the speedo.....as in 60 on speedo is 61.5 by gps.

and about the same rpm as you say you are getting.
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Old 03-07-2019, 06:14 PM
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I will have to do a gps check next time I drive it.
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