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Old 05-03-2008, 01:06 AM   #1
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33" with 3.07

I bought my jeep with 33's and 3.07 gears. I read about people needing to re gear. My jeep seems to have enough torque to be drivable do I really need to re gear?

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Old 05-03-2008, 01:20 AM   #2
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well i guess since your askin this you feel that its ok as it is. Do you NEED to re gear? no. But i think it would make a huge difference for you, espicially if you run trails.

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Old 05-03-2008, 01:44 AM   #3
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My 32's and 3.07's are tolerable. Going from Phoenix to up here in Payson, there are some pretty steep mountain roads and can take them at 65mph and stick to it(automatic). I'd definitely like to have some taller gears, but won't do anything until I get 35's.
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Old 05-03-2008, 03:05 AM   #4
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i used to be in the same boat but i was afraid my clutch was gonna kick the bucket if i kept the 3.07's. i then went all the way to 4.56 but that was way too much for daily driving so i stepped down to the 4.11's and it is perfect for me. i guess if u feel like u really dont need to regear, then dont do it.....but i would highly recommend it. most people will tell u to go to 4.56 but i dont believe that is necessary (sp?).
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Old 05-03-2008, 08:41 AM   #5
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For some reason 4:10 or 4:11's seem almost a perfect match for jeeps. I noticed a big drop in accel on my 98XJ/3:07's with 30's, I don't think 33's would improve that LT235's seem to be a good match with 3:07's.
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Old 05-03-2008, 12:47 PM   #6
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I never drove it with stock tires so i can't tell if it accelerates slower but i am sure it does. I think I want to go with 4.10 or 4.11. I don’t plan on getting tires bigger then 33". I do notice its hard to accelerate with out having to shift down a gear especially at 45 to 50mph in 5th gear
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Old 05-03-2008, 01:36 PM   #7
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wat about 31's and 3.07 on old 3-speed automatic? That is my intent... will i really be that upset with the loss in torque??
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Old 05-03-2008, 02:21 PM   #8
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I paid a deposit on my regearing yesterday; I am taking it in a week from Monday. My TJ is a six speed manual and I am going from 3.07 to 4.56 on 33X12.5 tires. 4.56 was recommended not just because of the 33's but because of their extra weight and the fact that at some point I am going to 35's.
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Old 05-03-2008, 02:55 PM   #9
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i had 32s with 3.07 gears and the 4-spd auto tranny for 1.5 years. it was ok for me.
then i had 35s with 3.07 gears, in the city it was still ok, but on the highway i couldnt use the 4th gear of the tranny because the RPM was too low to hold any speed over 45 mph.
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Old 05-03-2008, 04:55 PM   #10
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Quote:
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I bought my jeep with 33's and 3.07 gears. I read about people needing to re gear. My jeep seems to have enough torque to be drivable do I really need to re gear?
if its fine with you then no you don't need to regear.

i can't use 6th (and rarely 5th on the highway goin uphill) with 32's and 3.07's. i would love to regear. until then i guess i'll just use 4th.
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Old 05-03-2008, 05:09 PM   #11
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Quote:
Originally Posted by BlackE1 View Post
I bought my jeep with 33's and 3.07 gears. I read about people needing to re gear. My jeep seems to have enough torque to be drivable do I really need to re gear?
Yes, regear.
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I never drove it with stock tires so i can't tell if it accelerates slower but i am sure it does. I think I want to go with 4.10 or 4.11. I don’t plan on getting tires bigger then 33". I do notice its hard to accelerate with out having to shift down a gear especially at 45 to 50mph in 5th gear
You'll be amazed at the power that is available. that you're missing out on. Plus you might gain some mpg's and save your clutch.
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Old 05-03-2008, 05:13 PM   #12
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I have 3.73, 35s and 5 speed.. my rig holds 70 mph on 5th easily. I wonder why other guys with the same gears as me are having so many problems.

I cruize a lot since i have half an hr ride from my house to my college and i think my mpg has gone up because of the lower cruize rpm.
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Old 05-03-2008, 05:35 PM   #13
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I have 3.73, 35s and 5 speed.. my rig holds 70 mph on 5th easily. I wonder why other guys with the same gears as me are having so many problems.
the 6th gear of the manual 6spd tranny and the 4th gear of the 4spd auto tranny aren´t 1:1 like your 5th gear. they´re 0.69:1, that´s why these trannys have problems with 3.73 and 35s.
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Old 05-03-2008, 08:19 PM   #14
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i can hold 70 fine on a flat but no way i can hold it on an incline...in sixth
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Old 05-03-2008, 08:22 PM   #15
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Nico I have 5 speed .. 5 speed manual. my 4th is 1:1. I dont know what fifth is but at about 60 i'm going 1600-1700rpm.
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Old 05-03-2008, 09:47 PM   #16
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Mine is a 5 speed with 3.73's and a 4.0 with 35's and on a flat road at about 60 (by the speedometer) when I shift to 5th I lose speed. It pulls ok in 4th, but 5th feels like i am riding the brakes and giving it gas at the same time.
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Old 05-04-2008, 03:54 AM   #17
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could it be my "performance" mods? I know the throttle body taper was a bottle neck.
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Old 05-04-2008, 07:16 AM   #18
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The only TJs that dont have 1:1 top ratios are three speed autos...all teh others have some form of overdrive gear.
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Old 05-04-2008, 08:10 AM   #19
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Curious - if regearing makes such a big difference, why doesn't Jeep put the higher gears on to begin with. Surely the cost at manufacture can't be meaningfully different.

There must be some trade off with the higher gears - mileage? Don't see anyone here taking about the tradeoffs but there must be some.
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Old 05-04-2008, 08:23 AM   #20
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3.73's, which mine has is a great match up for the stock 30's. You only run into issues needing to regear when you throw on larger tire and get the ratio's messed up.
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Old 05-04-2008, 10:56 AM   #21
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Yup, what he said.. the gears are great with the stock tires. Running higher ratio on smaller tires will make ur cruizing rpm a lot higher so fuel economy will greatly suffer.
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Old 05-04-2008, 08:55 PM   #22
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Yup, what he said.. the gears are great with the stock tires. Running higher ratio on smaller tires will make ur cruizing rpm a lot higher so fuel economy will greatly suffer.
And we all know that the Mileage definitely doesn't need any more help suffering on our wranglers!!!
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Old 05-04-2008, 09:19 PM   #23
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i run 33s with 3.07s..

lol funny thing.. ive always assumed i had 3.07s bc my friend has the exact same model/year jeep i got and hes got 3.73s

i crawled under it tonite to make sure i have 3.73 because i got a d44 coming tomorrow with 3.73s

yep definately found out i got 3.07s..

btw.. my jeep drives just fine with 33s and 3.07s

do i have to pull the front driveshaft or will i be alright as long as i dont put it in 4wd
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Old 05-04-2008, 09:49 PM   #24
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I would just to be sure, you dont want to destroy your transfer case.
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Old 05-04-2008, 09:51 PM   #25
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yah.. they are pita to swap.. just did one a few weeks ago on a buddies yj.. while he sat and watched..

im looking into regearing both axles.. might as well but it wont happen for a month or so..

will driving this long without the same gears matter as long as i dont use 4wd and pull the front drive shaft?
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Old 05-04-2008, 10:02 PM   #26
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You should be fine if you pull the front shaft. I would definitely go ahead and regear to what you want on both axles instead of just regearing the front to match the rear.
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Old 05-04-2008, 10:06 PM   #27
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yah i wasnt going to regear the front to match.. thats for sure.. i was searching around to get a d30 with matching gears.. but i couldnt find one within 100 miles..

im looking at 4.56s or 4.88s because i know i want to run 36s soon anyways.. now its just time to save up to get it regeared
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Old 05-05-2008, 07:05 AM   #28
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I always thoughtthe automatics were the only ones to come with 3.07's...because there is no overdrive in the old 3-speed autos so to save gas mileage at interstate speeds they had to get smaller gears.
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Old 05-05-2008, 08:51 AM   #29
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When I purchased my Jeep it came with 3.07 and 33's. I did not get much use out of 5th gear on the interstate but I it was not a big issue to me. I have just regeared with expectations of going to a 35. I installed 4.88's and right now I can not get on the interstate. I top out at about 60mph, possibly 70 but rpm's are way to high. I think I should have waited on the 35's first. I am interested to see what happens when I get the right size tire. Also, when I am running 40mph, my speedo reads 70mph. I wonder if I will have to replace the speedo gear after getting the 35's installed.

My overall opinion depends on what you use your Jeep for. If you trail ride often and don't drive the interstate, go ahead and regear. It is amazing, and I mean amazing how much more power it has. Although, any vibes you have will be mangnified drastically due to the new gears.
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Old 05-05-2008, 04:32 PM   #30
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Branty, when you get the 35s, you will still need to replace the speedo gear with the proper one otherwise you will not have the right speed. With the stock gear and 35s, it will be a bit better that now but still not exact.

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