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Old 03-04-2012, 01:08 PM   #1
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gear question

what will happen if i run 4.56 gears on a 2000 3 speed auto? i know im suppose to run 4.10 but i just want to know what will happen. tires will be 33s when i upgrade my gears

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Old 03-04-2012, 01:21 PM   #2
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Your best bet for figuring the correct gear ratio for tire upgrades is to go out on the highway before you change tires and record the MPH at 2500, 2800, and 3000 RPM.
Take those figures and then go to Jeep Ratio Calculators
Apply those figures to that chart and pick the one that makes the most sense to you as far as the ratio that will give you the best mileage, closest to the factory, and the most power.
I went with the 4:88s in my Rubicon with 33"s and the mileage sucks. (13mpg) I may upgrade to a 34" or 35" tire though to see what change that will make.

Hope that helps.

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Old 03-04-2012, 01:41 PM   #3
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thanks. ya i understand that. but my concern is the 3 spd auto. i know i shouldn't go more than 4.10s since the jeep is my dd. but will 4.56 be a bad idea?
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Old 03-04-2012, 03:50 PM   #4
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Quote:
Originally Posted by KKhamesi View Post
thanks. ya i understand that. but my concern is the 3 spd auto. i know i shouldn't go more than 4.10s since the jeep is my dd. but will 4.56 be a bad idea?
Who told you that? IMO 4.56 is the perfect ratio for 33's and an auto trans. I understand it's your DD but unless your trying to do 80mph on the highway for long distances everyday you will be happy. Keep in mind engine load has as much to do with fuel economy as RPM.
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Old 03-04-2012, 03:57 PM   #5
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Quote:
Originally Posted by scot68

Who told you that? IMO 4.56 is the perfect ratio for 33's and an auto trans. I understand it's your DD but unless your trying to do 80mph on the highway for long distances everyday you will be happy. Keep in mind engine load has as much to do with fuel economy as RPM.
No 4.10/4.11 is the correct ratio for the 32rh transmission and 33s.
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Old 03-04-2012, 04:01 PM   #6
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Originally Posted by GoldenSahara00

No 4.10/4.11 is the correct ration for the 32rh transmission and 33s.
This.

4.56 is perfect for 33s and the 5 speed unless you have a 4 Banger

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