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Old 01-07-2014, 01:30 PM   #1
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Regearing for '13 JK Sport w/32s

I know this has been generally discussed on other threads, but I've never seen my exact question answered.

I've got a 13' JK Sport with 32" tires (actual) and 3.21 gearing. Its a dog. I've been frequently pulling a pop-up camper that weights out at 2900 lbs when fully loaded down to the beach (padre island natl seashore)--about a 3.5 hr. drive--and then out 10-15 miles on the shore. I have to get re-geared, obviously, and wish i had just gotten a Rubicon w/ 4.10s. Also getting an e-locker.

I don't want to get a lift in the near future (wife)--so I'm pretty much stuck at this size for a while. The jeep is a daily driver; but drive mostly in city, under 60 mph, and don't often go long distances in the JK (but sometimes).

All that said, I was going to get 4.56s. But the installer strongly suggests 4.88s. By my calculations, 4.88a would have me cranking 3000 rpms at 70mph, while 4.56s would have me at about 2800 rpms. The 4.88s put me outside the powerband on the "chart" with this size tire, while the 4.56 puts me on the edge.

Thoughts or recommendations very much appreciated.

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Old 01-07-2014, 01:47 PM   #2
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The 2 door is rated at 1K with 3.21 gears. Even with lower gears the maximum rating is 2k for towing.

If you think a 13 is a dog with stock size tires and 3.21 gears, what the heck were you expecting when you bought it?

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Old 01-07-2014, 01:58 PM   #3
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The problem with a 2-door and towing isn't getting it up to speed.

Even without a regear the 3.6 engine is not bad considering it isn't a designed from the ground up as a dedicated towing truck.

The problem is stopping. With almost 3x the max rated load, I'd be very worried about being able to "emergency" stop without winding up being pushed over a lane or two.

Please put electronic brakes on your trailer and a brake controller in the JK before considering a regear.

I frequently tow my little teardrop to places for camping. It's about 1500lbs, including 30 gallons of water in that weight.

Also, I'm unsure why you mentioned lockers. Lockers don't help at all with on-road towing. They would be useful for on-sand towing though once you get to the beach.
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Old 01-07-2014, 02:10 PM   #4
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Look into the cost of trading up to a sport unlimited with 3.73's. A regear with a locker could be $2000. And an unlimited would be larger for your camping, it would tow safer and better
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Old 01-07-2014, 02:40 PM   #5
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I'd suggest using this:
Gear Ratio Calculator
I found it beneficial to calculate RPMs at all speeds; not just freeway. If this is your daily, and you're mostly city- 4.88s might be ok. The RPM difference at freeway speeds isn't that different/noticeable (2800 vs. 3000) but that's a lot of gear for a 2 door with 32s. I have 35s and 4.56s are just right- but of course that is only my opinion.
As for towing I have to agree- sorry but I wouldn't tow a 2900 trailer with a 2 door. Looked into campers myself but with such a short wheelbase I've given up. I'd base my gear selection on everyday driving- I assume towing is why your installer is recommending 4.88s.
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Old 01-07-2014, 03:30 PM   #6
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its a 4 door. its rated at 3500 lbs. sorry i didn't clarify.
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Old 01-07-2014, 03:31 PM   #7
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Quote:
Originally Posted by daggo66 View Post
The 2 door is rated at 1K with 3.21 gears. Even with lower gears the maximum rating is 2k for towing.

If you think a 13 is a dog with stock size tires and 3.21 gears, what the heck were you expecting when you bought it?

Its a 4-Door unlimited, and rated for 3500 lbs, sorry. and yes, I wish i had bought a Rubicon.
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Old 01-07-2014, 03:34 PM   #8
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Quote:
Originally Posted by unusedusername View Post
The problem with a 2-door and towing isn't getting it up to speed.

Even without a regear the 3.6 engine is not bad considering it isn't a designed from the ground up as a dedicated towing truck.

The problem is stopping. With almost 3x the max rated load, I'd be very worried about being able to "emergency" stop without winding up being pushed over a lane or two.

Please put electronic brakes on your trailer and a brake controller in the JK before considering a regear.

I frequently tow my little teardrop to places for camping. It's about 1500lbs, including 30 gallons of water in that weight.

Also, I'm unsure why you mentioned lockers. Lockers don't help at all with on-road towing. They would be useful for on-sand towing though once you get to the beach.
1. I do have a controller. 2. The load is fine, as is the stopping distance. 3. I mentioned lockers in passing; I know they have nothing to do with towing.
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Old 01-07-2014, 04:17 PM   #9
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I've got a 2013 with "32 tires and 3.73 gears and it seems stronger than the one I drove with 3.21,s that I drove before I bought this particular one. It's a little buzzy above 70 mph but feels quicker around town and accelerating. Pretty good compromise over stock gears
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Old 01-07-2014, 05:41 PM   #10
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Ah, ok, you have a JKU then with both brakes and a controller.

Yes, a regear would then be the next highest priority in my "I'm not a jeep expert" opinion.

Personally with my equipment (Jk 2-door Rubi 4.10gears) I've not found myself wanting more power for towing, however I'm towing 1/2 the weight you are, with a Jeep that weights less then yours but has the same engine. Either a 4.56 or a 4.88 will give you more power then a 3.21 ratio...

As far as choosing between the two... I'm kind of a hands-on kind of person. Ask the shop doing the regear if they have a Jeep with 4.56's or 4.88's inside and take it for a little spin.

We could look at charts all day, but unfornately a chart does not tow your gear.
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Old 01-07-2014, 07:10 PM   #11
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Ah, ok, you have a JKU then with both brakes and a controller.

Yes, a regear would then be the next highest priority in my "I'm not a jeep expert" opinion.

Personally with my equipment (Jk 2-door Rubi 4.10gears) I've not found myself wanting more power for towing, however I'm towing 1/2 the weight you are, with a Jeep that weights less then yours but has the same engine. Either a 4.56 or a 4.88 will give you more power then a 3.21 ratio...

As far as choosing between the two... I'm kind of a hands-on kind of person. Ask the shop doing the regear if they have a Jeep with 4.56's or 4.88's inside and take it for a little spin.

We could look at charts all day, but unfornately a chart does not tow your gear.
Yea man you think I'm going to pull that with a 2-door? I'd be on two wheels! It does fine once I get moving and I have sway bars and some suspension upgrades that i installed. there's no adverse affect on control--I'm just wearing on the clutch from the start with 3.21s. I originally had a Silverado to pull it and the jeep was just a city ride for the wife, but a kid changed that and now I drive the jeep we sold the truck for a mommy ride. Believe me I would do it differently if I could go back. Anyways thanks for the input.

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