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Discussion Starter · #1 ·
I have tried to research this and I read a lot of "Trust me, you will want the 3.72 instead of the 3.21".

For me, this jeep will be a beach vehicle and possibly go down some dirt roads. I will not be rock climbing with it, I live in Florida. I would have to import rocks if I wanted to sue it like that. I hear people talking about the 3.72 is better for the bigger wheels. I am going to be keeping the 17" wheels that it comes with and what ever tires are stock-I assume this is not what people mean when they say "bigger" (the 17 or 18 vs the standard 16)?

The reason I want the 3.72 is that I may need to tow a small (19 foot or so ) boat and I need the 3500lbs of pull but would the 3.21 give me this as well?

The 3.21 is sooo much easier to find and if it is "enough" then I might as well take one instead of buying but I don't want to make a mistake.

Thanks for the help.
 

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Get 3.73 axles. You're only going to be able to tow a dingy with 3.21s.

2-door or 4-door with 3.21 axle towing capacity is just 1000 lbs.
2-door with 3.73 is rated 2000 lbs.
4-door 3.73 - 3500 lbs.
 

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Get 3.73 axles. You're only going to be able to tow a dingy with 3.21s.

2-door or 4-door with 3.21 axle towing capacity is just 1000 lbs.
2-door with 3.73 is rated 2000 lbs.
4-door 3.73 - 3500 lbs.
X2, don't settle for second best, get the 3.73!!!!!!!!!
 

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When they talk about bigger they mean tire diameter. The size of the wheel inside of the tire doesn't make much difference for the gear choice.

And I'd also suggest 3.73 gears too. 3.21 gears just aren't enough for towing anything significant.
 

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Unless you want to maximize your mileage or go for top end speed with the 3.21 gears, get the 3.73 gearing. The mileage won't be much lower, top speed won't be much less, and you'll be able to tow with less effort.
 

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Just ask Chrysler at the dealership do throw 4.56 gears in it and to give u a good deal.
 

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Had an '07 with 3.21's and a 6 speed. Added 33's and that Jeep couldn't get out of its own way. Now I've got a '13 auto with 3.73's and 35's. No complaints. Get the 3.73's and don't look back.
 

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I have a '14 JKU with 35's on 20" wheels using a 3.21. I wouldn't pull 2 people in a wagon behind it. I haven't done any rock climbing or anything like that but I'm still considering going down a little. Any tow package is gonna come with at least a 3.73 so that should be your answer.
 

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I had 3.73 with 35s and I was depressed.
3.21 would have had to have a full time therapist.

4.56 are solid w 35's but if I planed to pull 3-4k lb trailers etc I would have got 4.88
 

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I've got a 2013 JKU 3.21 and 33s. I'm regearing to 4.10s (and adding Truetracs.) Gotta get ride of the minivan feel.
 

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I am assuming we are talking 2014 vehicles. If so, get the
3.73 axle ratio on any vehicle that is a four door or has a manual transmission. You can go either way on the 2 door automatic, being that you are in Florida and will stay stock. The tow rating on vehicles with a 3.73 axle ratio is 3500 pounds for the four doors. 3.21's on the four door, and all two doors regardless of axle ratio can tow 2000 pounds. This is for all vehicles that are 2012 and newer.
 

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Discussion Starter · #15 ·
Thanks everyone and sorry for my incoherent questions. I usually try to proof read but I was typing and talking to an excited 7 year old about the Easter Bunny at the same time.
 

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Discussion Starter · #16 ·
I live in Florida with a 2 dr and 3.73's, it's ok but I would rather 4.56's because of the deep sand I run thru
Where in Florida could I use my jeep on the beach? Is there a list somewhere? As a kid we did it all the time (but in a VW bus). All those places now have condos on them. I would love to take my kids down the beach to go fishing.
 
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