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Old 08-31-2010, 02:32 PM   #1
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Gearing question

I have a 98 tj with the 4.0 I6 stock.
It has 33 inch wheels (but they only measure to be 31.5 )
5 speed stock manual tranny with 3.73 gears.

At around 75mph in 5th gear my rpm is around 2500.
If i hit a hill at that speed and gear it'll slow down dramaticly.

Lets say i regear to 4.53? i think it is.

How would that affect my rpm?
I know it would help with hills and stuff but i dont wanna drive around on the highway at 3000 rpm all day.
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Old 08-31-2010, 02:40 PM   #2
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I have the same problem with my '98 4.0 I6, stock gears, 33" tires. Im interested in hearing the answers to your question

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Old 08-31-2010, 02:43 PM   #3
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im running the 4 banger... the only advice id give if you dont wanna re-gear would just be to drop it down to 4th gear. thats what I have to do.
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Old 08-31-2010, 02:57 PM   #4
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Considering stock your at about 2500 rpm, you'll be at, and probably well over 300rpm.
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Old 08-31-2010, 03:03 PM   #5
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4:56 is a good ratio for YJ's like that...dunno what the final drive is in a TJ tranny for sure
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Old 08-31-2010, 08:28 PM   #6
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go 4.88 you wont regret it
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Old 08-31-2010, 08:43 PM   #7
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I've seen a chart that shows gear ratios for the tire size you want to run (by model year/trans). I think it might have been on the Quadratec website. I'll look for it. I'm doing the same research as you. Didn't know much about the issue until I wanted to run bigger tires and found out I have 3.07's.... Running 31" BFG A/t's at 70, I'm turning 2000 R's (5th gear)... I think it would do 100 at 3000 but haven't tried, yet...LOL

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