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Old 09-03-2008, 02:09 PM   #1
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got 33"s GEARS?

i have i-6 auto with 3:07's. all stock drive train d30, d35. looking at gears should i go with 4:56, or 4:88's? i just got my 33's, and my milage/performance is suffering. it's my d.d., i would like a little more power than stock, i don't run 80 mph+, so should i go with the 4:88's. how far off is my speedo now, i was doing 45 in a 45 zone, and a cop turned his cherrys on me, i slowed, he turned them off?????

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Old 09-03-2008, 02:12 PM   #2
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If you don't plan on getting bigger tires (35") in the near future, the 4.56 gears should be fine. As for checking your speedo.......use a GPS. If you don't have one, borrow one....somebody you know has to have one. That's the best way for monitoring your speed until you get a new speedo gear. Don't buy the speedo gear until you've decided on what axle gear ratio you want to run.

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Old 09-03-2008, 05:05 PM   #3
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gear change

I had the exact same set-up, I have the 5speed manual. I went with 410's.It's my DD also.I've been extremely happy with them. There's charts available online to decide on your choice's.The performance difference was like night and day.
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Old 09-03-2008, 06:06 PM   #4
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Your 3-speed automatic gives higher rpms than happen with a 5-speed or the current 4-speed automatic. Because of that, neither 4.56 nor (especially) 4.88 would be a good choice for 33" tires.

For 33" tires, 4.10 would be a very good choice that would give you good offroad rpms as well as good highway rpms. 4.56 with 33" tires and your 3-speed automatic would cause your engine to be turning over right at 3250 rpms at 70 mph, too high for most people. 4.88 would produce even higher rpms, don't even think about that ratio.

The only way I'd go 4.56 is if you're considering upgrading to 35" tires sometime in the not too distant future.
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Old 09-03-2008, 10:29 PM   #5
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Originally Posted by Jerry Bransford View Post
Your 3-speed automatic gives higher rpms than happen with a 5-speed or the current 4-speed automatic. Because of that, neither 4.56 nor (especially) 4.88 would be a good choice for 33" tires.

For 33" tires, 4.10 would be a very good choice that would give you good offroad rpms as well as good highway rpms. 4.56 with 33" tires and your 3-speed automatic would cause your engine to be turning over right at 3250 rpms at 70 mph, too high for most people. 4.88 would produce even higher rpms, don't even think about that ratio.

The only way I'd go 4.56 is if you're considering upgrading to 35" tires sometime in the not too distant future.
Good catch. I didn't even see that he was driving a 2000 with a 3-speed. I just assumed he was driving a 4-speed. How's that for situational awareness? Looks like I'm slipping.......
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Old 09-04-2008, 06:32 AM   #6
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thanks, i had heard of 4:56 for the auto, but 4:10's sound better now. im prob going to stay with 33's for aleast another year!
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Old 09-04-2008, 07:31 AM   #7
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Gear/Tire Size Chart from 4lo.com.

4Lo.com :: Gear Ratio & Tire Size Chart

Not meaning to jack the thread....
I have 4.10's with stock 31x10.50's. I have read on this forum or another that the Rubicon was supposed to come with 33's and is thus overgeared. Will I get better gas mileage if I go to the 33's? This chart says that I could go up to 34's or 35's and have even better mileage, but I don't see how this factors in the weight of the tire. Does anybody with any experience agree with this chart?

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