Axle gear for 33” tires - JeepForum.com
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post #1 of 35 Old 06-03-2018, 05:24 AM Thread Starter
Hardhead69
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Axle gear for 33” tires

Just bought a 1991 jeep wrangler, it has a four inch life and i just bought 33 tires for it. Five gear is useless now, it has a 3.73 rear in it and it is a 4.0 with a five speed. What axle ratio would you guys recommend i put in it? Was thinking of 4.56 but not sure.

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post #2 of 35 Old 06-03-2018, 05:45 AM
jason280
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I have a '94 JY with a 4" lift and 33" tires, also with a 4.0L and 5 spd manual. One of the first things I did was swap in an 8.8 with 3.73s, and I never had an issue not being able to use 5th gear. Now, 5th was absolutely worthless with 33" tires and the standard 3.07 ratio, but I never had any problems with 3.73s. That being said, I eventually went to 4.10's simply because it seems to be a better fit offroad for 33" tires.

Have you verified that you do in fact have 3.73 gears? Most of the 4.0L manuals I've seen had 3.07s....

Personally, I think 4.10s are perfect with the 5spd and 33" tires.

None
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post #3 of 35 Old 06-03-2018, 05:51 AM Thread Starter
Hardhead69
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Yeah not confirmed that they are 3.73, thats what i was told was in there by previous owner, he said he had that put in. I have the build sheet for the jeep and it came from factory with the 3.07. Either way i am looking to change it.
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post #4 of 35 Old 06-03-2018, 06:20 AM
timatoe
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If you're sure you'll never go bigger than 33's, 4.10's will put you back to stock essentially 4.56 will be better.

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post #5 of 35 Old 06-03-2018, 06:29 AM Thread Starter
Hardhead69
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I Don't plan on going any bigger then the 33’s.
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post #6 of 35 Old 06-03-2018, 06:42 AM
Waternut
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If 33's are where you plan to stop, you have a lot of options with 4.10's. You can buy the gears and install or have them installed but that's probably the most expensive option. You can go get used YJ axles from a 4 cyl with 4.10 gears from Craigslist, Facebook, or a junkyard and then try to sell yours with the hope of breaking even. Lastly, you can do either of the previous option just on the front axle and then go get a used 8.8 from the junkyard with 4.10 gears and research how to install that in place of your weak dana 35.


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post #7 of 35 Old 06-03-2018, 07:02 AM
Joe Dillard
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Not all 33's are created equal - not even close.

EG: some wimpy LT or AT "33's" are closer to 31's and some are narrow with weak flimsy sidewalls and light weight. On the other hand, some 33's are closer to 34's, wide (12.50"+), tough thick sidewalls and 64+lbs. Rolling resistance varies greatly between the "same size" tires which in turn affects how well it'll perform using the exact same gear ratio, engine, tcase & tranny.

Yes, using a gear ratio calculator should get you close - but if you're on the heavy & aggressive side, perhaps the deeper ratio would suite you.

While trying to dial-in your final gear ratio, you should also take into account how heavy & the actual tire dynamics, especially if you're on the higher side in height, weight, width, aggressive tire tread plus weight of the wheels.

I have ran 8 different size tires on my YJ. Three of those were with three different "33's".
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post #8 of 35 Old 06-03-2018, 07:04 AM
JeeperDon
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It came with 3.07 gears and 27" tires. The math works out to 3.07 / 27 x 33 = 3.75. Doing 3.73 will get the stock motor RPM range back. I'd go 4.11 for a bit of spunk at the traffic lights, and to help compensate for the extra rolling mass of the larger tires.

'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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post #9 of 35 Old 06-03-2018, 09:31 AM Thread Starter
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I put a set of 33x12.5 bfg at ko2. It had a set of swampers on it when i got it but they are to loud for me on the highway. I only go offroad couple times a month so the at should be good.
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post #10 of 35 Old 06-03-2018, 01:15 PM Thread Starter
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Found a set of axles with 4.10 gears out of a 95 jeep with 68000 miles. Guy asking 400 for them, seems a little high to me?
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post #11 of 35 Old 06-03-2018, 02:19 PM
timatoe
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Quote:
Originally Posted by Hardhead69 View Post
Found a set of axles with 4.10 gears out of a 95 jeep with 68000 miles. Guy asking 400 for them, seems a little high to me?

Call a shop and get a quote on doing a re-gear.
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Quote:
Originally Posted by George Orwell
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post #12 of 35 Old 06-03-2018, 02:20 PM
shaggyjim
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400 is way cheaper then re-gearing your other axles if they are in good shape. If your going to re-gear I would do 4.56's. It won't hurt to over gear a little and "If" you ever make the jump to 35's your all set.
I never thought I would go bigger then 35's but I went 4.88's just incase and now I want to step up to 37-39's and I'm good to go. Its worth thinking about anyway.
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post #13 of 35 Old 06-03-2018, 08:08 PM
jason280
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Quote:
Found a set of axles with 4.10 gears out of a 95 jeep with 68000 miles. Guy asking 400 for them, seems a little high to me?
$400 isn't unreasonable, assuming that's the front D30 and rear D35. Do you have any plans to swap out the Dana 35 rear?

Personally, the first thing I would do is confirm the ratio currently in the Jeep.

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post #14 of 35 Old 06-03-2018, 09:04 PM
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I sold my rear D35 for $250 and a lot of junkyards sell axles for more than that so $400 for both is super cheap IMO.

Gears and installation kits will cost you more than $400. Then if you're going to pay someone to install them...well...$$$


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post #15 of 35 Old 06-04-2018, 04:50 AM Thread Starter
Hardhead69
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found a 4 cylinder parts car i can get for $600. Might grab that
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