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Old 02-27-2012, 12:13 PM   #1
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Gear question

Hey guys not sure if this has been asked before. But I just got me a 2000 TJ with a 4.0 and automatic. I have a 3.5 inch lift with 33's. I need some advice on gearing. The build sheet says I have 3.07 gears. Not sure if the previous owner did a gear swap, he was a mild wheeler. when I cruise at 70 on the highway the RPM's are at about 2200. I guess I'm looking for the best option for MPG and mild wheeling. Should I upgrade to 3.73's or 4.10's? Thanks guys.

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Old 02-27-2012, 04:25 PM   #2
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#1 Yes this question gets asked a lot
#2 Based on the info you have given, your Jeep is still running with factory 3.07 gears, in my humble opinion.
#3 Changing the gears is not mandatory, but it will help with acceleration & probably gas milage, once again, this is my opinion.
#4 What I have read on this & other forums is that a 33 inch tire needs 4.56 gears.

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Old 02-27-2012, 04:48 PM   #3
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Quote:
Originally Posted by 50Johnbob View Post
#1 Yes this question gets asked a lot
#2 Based on the info you have given, your Jeep is still running with factory 3.07 gears, in my humble opinion.
#3 Changing the gears is not mandatory, but it will help with acceleration & probably gas milage, once again, this is my opinion.
#4 What I have read on this & other forums is that a 33 inch tire needs 4.56 gears.
with the OPs 3 speed auto, 4.10s are the recommended gears. 4.56 is what is recommended with the 5 speed manuals.
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Old 02-27-2012, 06:16 PM   #4
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I dont know how accurate this is. but I use it for everything. when in doubt go taller
Gear Ratio Calculator
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Old 02-27-2012, 06:23 PM   #5
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You provably still have 3.07s. 4.10s would be optimal for your 3 speed auto but many people run stock gears on 33s. I don't know what its like as I have a 5 speed. If you do think you want some lower gears, if you have the D35 then you can get a set of axles from a 4cyl which will most likely be 4.10 for cheap. If you have a D44 rear it wouldn't be worth swapping in a much weaker axle.
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|2004 Jeep TJ "Green Machine"|4.0L 5 speed Dana44|33x12.50x15 Goodyear Duratracs|2.5" RC coils + 1.25" body lift|OME NitroSport shocks|4.56 gears|Skid Row Engine Skid|BCC Sliders|Currie AntiRock|
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Old 02-27-2012, 08:31 PM   #6
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Originally Posted by schnutzy View Post
with the OPs 3 speed auto, 4.10s are the recommended gears. 4.56 is what is recommended with the 5 speed manuals.
Thank you schnutzy for catching my mistake. I guess I'll have to work on my reading comprehension skills.
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Old 02-27-2012, 09:28 PM   #7
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Originally Posted by 50Johnbob View Post
Thank you schnutzy for catching my mistake. I guess I'll have to work on my reading comprehension skills.
happens to us all

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