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Old 02-03-2014, 04:40 PM   #1
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33s with 3.07 gears

about to lift my jeep and put 33s on it and crawled under it today and found ouit i have 3.07 gears. Just wanted to hear from people with this same setup. Is it as bad as ive read? didnt really want to spend any more money on it right now other than the lift and tires. jeep is used on road only. I have 31s now and it drives fine, i mean i dont win any races but its fine to me.

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Old 02-03-2014, 05:01 PM   #2
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I have 3.07 on 33s with a 4" lift. Here's the scoop. It's "fine". The MPG isn't optimal, on the 5 speed around town I ride it out to 3k RPMs so when I shift into the next gear the engine doesn't lug. I drop gear often. I'm slow. Yes i'm going to regear in the future. If you really want 33s I would do it with a 5 speed manual. Auto I would think twice. I love driving my Jeep even though it's undergeared and lugs. I don't even use 5th gear on the highways. My commute is not long.

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Old 02-03-2014, 05:04 PM   #3
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Well...... if its anything like mine you aint gonna win any races. I haven't had any trouble with pulling my boat trailer, except 55 is about top end and lets not talk about headwinds or hills. When we go play in the mud it does a great job. I am currently running Hercules Trail Diggers and they are great. Everything seems to work good except for top speeds. Your experience may be different. I dont know how to post pics but I have some in my profile gallery.
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Old 02-03-2014, 05:17 PM   #4
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If you live anywhere around mountains and hills, you're going to hate yourself if you don't regear. I went from 31's to 33's with 3.07's, and I hated it. Now I have 4.10's, and it's a big difference. Good luck.
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Old 02-03-2014, 05:19 PM   #5
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I see your TJ is a '98 - is it an Auto or Manual?
The 3 speed Auto is probably the least worst combo with 33's and 3-07's but it's still pretty bad.
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Old 02-03-2014, 05:42 PM   #6
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It works and you can deal but it lugs. You should save up for a regear before you regret it. 4.56 with a manual, 4.88 with an auto.
In 5th gear at 65, the revs are about 1650, that's way too low for a 4.0 to be pulling. Full throttle would be needed to hold that speed without downshifting. So highway riding is mostly 4th, 5th on flat spots and downhills.
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Old 02-03-2014, 06:40 PM   #7
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It is a 5speed. How much does a regear cost? and would swapping axles with a 4cyl. be a better option moneywise?
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Old 02-03-2014, 07:04 PM   #8
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It is a 5speed. How much does a regear cost? and would swapping axles with a 4cyl. be a better option moneywise?
Typical regear for both axles in our area is around $1500 parts and labor. It's definitely worth doing. If yours is a 4.0L with a 5 speed running 33's, you should have 4.56's installed. You could probably find 4.10's in complete axles easy enough, but you would have a harder time finding the 4.56. I drove my 33's with 3.07's about a month before I got sick of it and spent the $'s.
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Old 02-03-2014, 07:06 PM   #9
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It is a 5speed. How much does a regear cost? and would swapping axles with a 4cyl. be a better option moneywise?
I think a regear could go $1200-$1500 depending on brand and labor. The 4 cyl has 4.10 gears. It would be much better for money if you can find a good set. But it's not the best gear. Look around and do it right one time. It's money you want to spend. Read on the forum here, lots of threads on this.
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Old 02-03-2014, 07:17 PM   #10
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Thanks. Ill check around. so what model year 4cyl. will bolt right up to my 98?
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Old 02-03-2014, 07:54 PM   #11
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Thanks. Ill check around. so what model year 4cyl. will bolt right up to my 98?
I believe any 97-2006 will.
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I know of no major design changes suspension wise for the TJs
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Old 02-03-2014, 07:57 PM   #12
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I ran my TJ with 3.07's and 35's for about a month and it was awful.

Personally I think 4.56 may be overkill for 33s but 3.07 will probably suck too. 4.10s would be fine IMO.

I ended up getting a Ford 8.8 w/LSD from East Coast Gear Supply for ~$1000 shipped and bought a used Dana 30 off a local guy for $125.

4.10s with the auto 3spd and 35s works pretty well and I ended up with a much stronger rear axle, disc brakes, and better gearing for about the same amount (possibly less) than a regear would have cost me.

And yes the 4cyl dana 30 is bolt in.
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Old 02-03-2014, 08:00 PM   #13
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Personally I think 4.56 may be overkill for 33s but 3.07 will probably suck too. 4.10s would be fine IMO.
4.56's are perfect for 33's with a 5 speed both on the highway and off road.
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Old 02-04-2014, 07:57 AM   #14
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I had 3.07 and it sucked badly with the skinny 28's. I could not imagine trying to push 33's around with that ratio. 4.10's work real well for me. Some say 4.56 would be better...
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Old 02-04-2014, 08:23 AM   #15
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The only regret I have about the one I bought is gearing - I didn't know enough at the time to check. 3.07 on 31s is pretty crappy - at least in N.GA where I am (in my opinion). So I can't imagine how bad it'd be with 33s. At some point (pretty far down my list) a regear will happen. Someone posted this chart which should help you decide. According to it, 4.10 is just a touch below the "sweet spot".

Tire & Gear Ratio Chart at Morris 4x4 Center
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Old 02-04-2014, 09:40 AM   #16
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I currently have 33's with 3.07s. Yes you can get by but it does suck getting up to highway speeds and staying there, when you come up to a hill, in the wind. If I could do it over I would listen to everyone on here and regear first. For my 02 5 speed 4.0 I would go to 4.56's or maybe 4.88's for larger tires in the future.
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Old 02-05-2014, 01:37 PM   #17
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3.07s suck a monkey butt with 30 inch tires.. Cheap jeeple will say its fine because they want to justify not regearing. The reality is its gonna suck something bad.
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Old 02-05-2014, 01:39 PM   #18
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3.07s suck a monkey butt with 30 inch tires.. Cheap jeeple will say its fine because they want to justify not regearing. The reality is its gonna suck something bad.
While I probably would have worded it a bit differently I agree 100%.
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Old 02-05-2014, 02:10 PM   #19
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I have 33s with 3.73 gearing. It's alright, but I really wish it was 4.56.
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Old 02-05-2014, 02:16 PM   #20
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so its probably gonna suck
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Old 02-05-2014, 02:24 PM   #21
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so its probably gonna suck
Pretty much.
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Old 02-05-2014, 02:29 PM   #22
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Driving it with 3.07 gears and 33s would give you a reason to save the money for a regear...
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Old 02-05-2014, 04:51 PM   #23
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so its probably gonna suck
20 posts say the same thing.
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Old 02-09-2014, 08:46 AM   #24
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I currently have 3.07s with my 33s and it sucks...with the 3 spd auto what's the best overall gearing? Looking for something in the middle of the gas mileage/power..4.10's?

Also which method is most cost efficient swapping other axles on with the different gears?? Don't do a whole lot of extreme wheeling mostly light mud and trails.
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Old 02-09-2014, 09:06 AM   #25
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Maybe because I don't know any better, or maybe because I live in the flat lands of Florida, but, I run my combo all over the beach, and also wooded, rutted trails without any issues.

Mine is standard and at 60 mph in 5th..........nice and smooth.
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Old 02-13-2014, 01:23 PM   #26
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My wife's Jeep has 33's with 4" lift, 3.07 gears, automatic and it drives just fine - on the street! BUT - (take note here) it is strictly a "MALL CRAWLER"!
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Old 02-14-2014, 12:58 PM   #27
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I have 31's and 3.07 and it's fine around town and in low gear on the (relatively tame) trail, but is anemic on the highway. Mine's not a DD, so i'm gonna leave it like it is. I just can't justify $2k+ for regearing.

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