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Old 06-20-2014, 11:57 PM   #1
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33s with stock gearing

Have a 2.5 inch lift and I want to run 33s, I'm just worried about the gearing, will the stock 3.07 gears be ok or will I hate my life

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Old 06-21-2014, 12:43 AM   #2
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I am running 33's on a 3.75" lift with the stock gearing. Driving around town or even off the road there are no issues. The only time I notice it is when I am on the highway going up hills. I rarely use 6th gear. Its really not a big deal for me anyways.

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Old 06-21-2014, 01:01 AM   #3
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Ok awesome, thank you
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Old 06-21-2014, 01:39 AM   #4
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If you hate life, $1200 will make it all better to get the gearing right.
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Old 06-21-2014, 06:51 AM   #5
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Results will vary depending on which transmission you have.
I have the 3 speed auto and have been told it's the least worst combination but it still had it's shortcomings (I have since re-geared).
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Old 06-21-2014, 07:02 AM   #6
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Originally Posted by vdowd33 View Post
I am running 33's on a 3.75" lift with the stock gearing. Driving around town or even off the road there are no issues. The only time I notice it is when I am on the highway going up hills. I rarely use 6th gear. Its really not a big deal for me anyways.
I didn't know some TJ's had a six speed, I rarely use fifth gear with 33's I can't imagine a six speed tranny.
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Old 06-21-2014, 07:47 AM   #7
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The 6 speeds will come with 3.73 gears (non rubicon) and regearing for 33's is still advisable.
Running 3.07's will be horrible on 33's if you are concerned with performance and mpg's. Yes regearing will help both when running 33's and choosing the right gear will be based on your transmission depending on if your have the 5 speed, 3 spd auto or 4spd auto.

There are tons of threads on the subject.
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Old 06-21-2014, 10:46 AM   #8
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You have 2 choices. Save up for a re-gear, or start saving up for a new transmission that will probably fail prematurely from running that gear/tire combo
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Old 06-21-2014, 11:47 AM   #9
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You have 2 choices. Save up for a re-gear, or start saving up for a new transmission that will probably fail prematurely from running that gear/tire combo
so basically 33s with 3.07s is a bad idea
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Old 06-21-2014, 12:42 PM   #10
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so basically 33s with 3.07s is a bad idea
Its not the best but its manageable. Im saving for a regear and while the 3.07's and my 5 speed dont exactly suck they dont exactly not suck also. I still manage 17mpg and DD my jeep 60 miles round trip every day.
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Old 06-21-2014, 12:43 PM   #11
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It's your Jeep, so that's really up to you to decide. You will hear many people say they drive fine with a mis-matched gear/tire size and that they either don't mind or don't feel a difference. That doesn't mean your tranny can't feel the difference and is now working extra hard to spin those wheels. Yes it can be done, and I myself am dying to put bigger tires on but have 3.55 gears and running 30" tires. I'm waiting to save up and then regear, lift and bigger tires. I would rather do it the proper way the first time
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Old 06-21-2014, 01:05 PM   #12
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so basically 33s with 3.07s is a bad idea
Yes.
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Old 06-21-2014, 02:59 PM   #13
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so basically 33s with 3.07s is a bad idea
X2- ;D35 -D30 We are getting estimates to re-gear (to 3:56) both front/rear,labor and material....1900.00 here in So Cal.
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Old 06-21-2014, 07:02 PM   #14
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X2- ;D35 -D30 We are getting estimates to re-gear (to 3:56) both front/rear,labor and material....1900.00 here in So Cal.
I hope that was a typo and that you meant 4.56. You can likely do a lot better than $1900 if you push/negotiate harder for a discount.
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Old 06-21-2014, 09:46 PM   #15
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I'm running 33's with 3.07's (per tag on diff) with a 5 spd, 4.0. No problems. I'm thinking the PO may have regeared as I am always running under 2k on the tach. Seems to pull fine on the street and highway. May do the driveshaft test or just pull a cover and see if the ring is stamped. Either way, it is okay however, a regear would be best..
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Old 06-21-2014, 09:58 PM   #16
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Hey everybody, there's a YJ guy here.
For the longest time, I had 33's with the stock 3.07 gears. It was awesome, if you like being able to go 70mph in 3rd gear without breaking a sweat, and also awesome if you want to never use 5th (or 6th).
But really, going up steep hills; not gonna happen. Gotta bite the bullet and regear. I have 4.10, and it's night and day difference.
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Old 06-21-2014, 10:08 PM   #17
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Hey everybody, there's a YJ guy here. For the longest time, I had 33's with the stock 3.07 gears. It was awesome, if you like being able to go 70mph in 3rd gear without breaking a sweat, and also awesome if you want to never use 5th (or 6th). But really, going up steep hills; not gonna happen. Gotta bite the bullet and regear. I have 4.10, and it's night and day difference.
thank you for the input
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Old 06-21-2014, 10:35 PM   #18
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Hello, I have a 1997 TJ with 33's and stock 3.07 gearing. I want to regear but I can't decide on 4.10 or 4.56 any opinions or experience of your own?? Also I plan on going up to 35's one day as well
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Old 06-22-2014, 11:03 AM   #19
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I hope that was a typo and that you meant 4.56. You can likely do a lot better than $1900 if you push/negotiate harder for a discount.
Yes a typo- 4:56, Thanks Jerry.
We went to 3 reputable local jeep repair shops and found that they were all within +/- a few bucks. I am open for any suggestions still.....
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Old 06-22-2014, 11:40 AM   #20
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Shops will always quote high prices like that at first and hope you'll just accept it without question. Both of my regearing jobs produced similar high priced quotes at first but I got the first one down to $1300 and the last one just under $1100. You have to learn that higher price jobs like regearing are always negotiable... with the shop just hoping you don't know that.

It may be too late for this but looks of total shock, expressing anger at such a high price, asking "are you serious", and "no way would I pay anywhere near that" are age-old methods of getting a more realistic price.
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Old 06-22-2014, 12:16 PM   #21
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I'm running 3.07 with 33's. 6spd gearbox. It's far from perfect but you just drive in a gear lower. The 6spd has a lower 1st gear ratio and 5th is geared the same as 4th on a 5spd. It's not the horror show some people think it is, at least on a 6spd. It's a job I'll get round to eventually but I can live with it for now. I've no idea why someone would think the transmission will blow up?
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Old 06-22-2014, 02:55 PM   #22
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I have a 2005 automatic with I believe 3.73 gears and I want to eventually go up to 33's, is that ok?
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Old 06-22-2014, 03:06 PM   #23
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I have a 2005 automatic with I believe 3.73 gears and I want to eventually go up to 33's, is that ok?
Your engine RPMs will be so low that you'll constantly have to be turning the Overdrive off to stop the engine from lugging. To make that combination work, 33" tires and your 4-speed automatic, 4.88 gearing would be the way to go. 4.88 may sound like an excessively low ratio for 33" tires but it's the correct ratio to regear to when you have the 42RLE transmission as you do. The reason being that the 42RLE has a .69 Overdrive gear ratio which means it produces RPMs nearly 40% lower than what the gear ratio charts indicate.
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Old 06-22-2014, 06:09 PM   #24
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Your engine RPMs will be so low that you'll constantly have to be turning the Overdrive off to stop the engine from lugging. To make that combination work, 33" tires and your 4-speed automatic, 4.88 gearing would be the way to go. 4.88 may sound like an excessively low ratio for 33" tires but it's the correct ratio to regear to when you have the 42RLE transmission as you do. The reason being that the 42RLE has a .69 Overdrive gear ratio which means it produces RPMs nearly 40% lower than what the gear ratio charts indicate.
Jerry is right. I have the 4speed 42lre auto, 3.73 stock gears and 33s. Been driving like that for a yr. it sucks to say the least. I daily commute everywhere above 45mph and alot of highway at 70mph. First thing i do after buckling up is hit the OD switch.

I will be going the 4.88 route with the 4speed auto and my 33s very soon.

DO NOT listen to anyone with a 3speed or manual tranny about what gears you should have. Theyre not the same!!

My shops around here wanted 4.56 and im sorry but when i go to regear im not asking for advice just put the 4.88s in there.

Buddy just got 4.88s same setup and its perfect for 33s.
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Old 06-22-2014, 10:05 PM   #25
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Jerry is right. I have the 4speed 42lre auto, 3.73 stock gears and 33s. Been driving like that for a yr. it sucks to say the least. I daily commute everywhere above 45mph and alot of highway at 70mph. First thing i do after buckling up is hit the OD switch. I will be going the 4.88 route with the 4speed auto and my 33s very soon. DO NOT listen to anyone with a 3speed or manual tranny about what gears you should have. Theyre not the same!! My shops around here wanted 4.56 and im sorry but when i go to regear im not asking for advice just put the 4.88s in there. Buddy just got 4.88s same setup and its perfect for 33s.
ok so 4.88 for auto with 33's what about a 5 speed with 33's? Still 4.88?
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Old 06-22-2014, 10:26 PM   #26
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ok so 4.88 for auto with 33's what about a 5 speed with 33's? Still 4.88?
4.56.
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Old 06-22-2014, 10:34 PM   #27
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4.56.
Thanks! I was leaning toward that, it just seems like to low of a gear ratio, I don't want high RPM's cruising down the highway you know.
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Old 06-22-2014, 10:44 PM   #28
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Guys im new to jeeps and have never rebuilt a jeep rearend but I have rebuilt 2 ford 8.8" rears with 3.73 gears and to be honest it wasn't that hard. Biggest problem came from trying to torque the pinion nut on sawhorses, totally impossible. Ended up installing the rearends and doing pinion final torque with rearend installed using trucks weight and brakes to hold it in place.
Now some of you might want to know why I had to rebuild 3.73s twice. Well it was 2 separate vehicles and both rears are still running to this day to my knowledge.
The 1st rebuild was a learning experience and ALOT of time spent on the web reading different peoples instructions and looking at their pics. I was quoted at roughly the same price ive seen on here for shops to do the jobs for me. Doing the work myself I stll spent $1k on the 1st rearend and $900 on the second. If you don't mind turning wrenches and don't really trust someone else to do a job on your vehicle as well as you would id say do it your self. I have to admit though that with my personal labor + parts I guess its almost worth it to allow someone else to do the job. If I actually trusted someone to work on my vehicles that is.
If I had a proper shop I would have tightened the pinion using a vice of course but im a redneck shadetree mechanic.
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Old 06-23-2014, 05:05 AM   #29
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I want to put lower gears in my dana 35, it has 3.08 now and I am thinking about either 4.56 or 4.88. Do I have to change the spider gear housing as well as the ring and pinion or just the R&P? If I do what do you think about going ahead and putting a trutrac in it?
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Old 06-23-2014, 10:22 AM   #30
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I don't want high RPM's cruising down the highway you know.
If the RPMs 4.56 produced were excessive on the highway I wouldn't be constantly recommending it.

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