towing capacity with lift. - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 7 Old 04-21-2014, 07:36 PM Thread Starter
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towing capacity with lift.

Hi all, I have a 2014 JKU with 35's, 3.73 gear and 5 speed auto. Did I lose any of my 3500lb towing capability by adding the tires with no gear change? Do I need to regear to get my power back and if so what gear would equal the factory performance level with the 3.73's. I will be towing a 3200lb pop up from East TN to Orlando Fla and I don't want to hurt anything by not regearing.

Thanks
Scott

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3" Mopar Stage 3 Lift
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post #2 of 7 Old 04-21-2014, 09:14 PM
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Quote:
Originally Posted by rsjohnsn View Post
Hi all, I have a 2014 JKU with 35's, 3.73 gear and 5 speed auto. Did I lose any of my 3500lb towing capability by adding the tires with no gear change? Do I need to regear to get my power back and if so what gear would equal the factory performance level with the 3.73's. I will be towing a 3200lb pop up from East TN to Orlando Fla and I don't want to hurt anything by not regearing.

Thanks
Scott
There are several threads on the forum that will address your gearing question. Some even have charts that will allow you to compare various setups. Should be easy to find with a search.

Some short/general comments though . . .

You won't technically lose any of your tow capacity, but you will almost certainly feel the difference with that heavy of a trailer behind you. How much you feel it will depend on how much lift you have and how tall or wide that trailer is. If you'll be catching a lot of air, you'll notice the power loss much more. 3.73s are not the "towing gears" for the JKU anyway. Max trailering package should've come with 4.10s unless that changed since '12.

With the auto, you'll want to pay attention to the OD shifting. If it seems like the tranny is searching for a gear, you're going to build a lot of heat, which won't be good. I would recommend taking the setup on a short trip to see for yourself how dramatic the change is. And if you have or can get a way to monitor the tranny temp, that would be a great way to put your mind at ease or indicate that you need to make some corrections.

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post #3 of 7 Old 04-22-2014, 05:48 AM Thread Starter
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After doing some searching, I found that at 70 mph I am running around 2150 rpm with the 34 inch tires. This is slightly out of the performance range and it looks like a 4.10 is recommended. That is allot of money just to go from 3.73 to 4.10 and not sure it is worth it.

Scott

2014 JK Unlimited
3.6 Pentastar 5 Speed Auto
Dune / Oscar Mike Edition
3" Mopar Stage 3 Lift
315/70x17 Duratracs on AEV Wheels
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post #4 of 7 Old 04-22-2014, 11:42 AM
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Quote:
Originally Posted by UnlimiDozer View Post
There are several threads on the forum that will address your gearing question. Some even have charts that will allow you to compare various setups. Should be easy to find with a search.

Some short/general comments though . . .

You won't technically lose any of your tow capacity, but you will almost certainly feel the difference with that heavy of a trailer behind you. How much you feel it will depend on how much lift you have and how tall or wide that trailer is. If you'll be catching a lot of air, you'll notice the power loss much more. 3.73s are not the "towing gears" for the JKU anyway. Max trailering package should've come with 4.10s unless that changed since '12.

With the auto, you'll want to pay attention to the OD shifting. If it seems like the tranny is searching for a gear, you're going to build a lot of heat, which won't be good. I would recommend taking the setup on a short trip to see for yourself how dramatic the change is. And if you have or can get a way to monitor the tranny temp, that would be a great way to put your mind at ease or indicate that you need to make some corrections.
I have a '13 with the max tow/trailer package. It included the wire harness, hitch, LSD, and 3.73 gears. If it came with 4.10's I'd bust my nut
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post #5 of 7 Old 04-22-2014, 07:36 PM
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i have a 2.5 lift with a 33ish inch tire and tow a 3300 lb bow rider boat all summer long. 250+ mile trips along with short trips with lots of hills. I have never had an issue, however pulling out "quick" isnt going to happen. i can hold 70 on the highway with no issue. and stopping is fine (also have surge brakes on the boat trailer) i take it easy pulling out and even up a 8% grade that is over a mile long, i can hold 65MPH. (this is on a 2012 with 3.73 and auto

i did buy a aeroforce gauge to monitor my trans temps this year...but have not towed with it yet

2012 Black JKU , 2.5 RockKrawler lift, 285/75-17 nitto terra's, Custom AtoZ sliders, AtoZ bumper with Quadratec I9500 winch..
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post #6 of 7 Old 04-24-2014, 08:23 PM Thread Starter
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Ok, I test towed the popup tonight and I didn't like it. The trailer was empty and weighed in at roughly 2600 lb and I couldn't pull a decent grade without it dropping to 3rd gear. Everything went great and handled fine but I see alot of gas to haul this to and from Florida. I live in East TN at the base of the Smoky Mountains so hills are a daily occurrence. Now, do I go 4.56 or 4.88 gears?

Scott

2014 JK Unlimited
3.6 Pentastar 5 Speed Auto
Dune / Oscar Mike Edition
3" Mopar Stage 3 Lift
315/70x17 Duratracs on AEV Wheels
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post #7 of 7 Old 04-25-2014, 09:23 AM
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Quote:
Originally Posted by UnlimiDozer View Post
Max trailering package should've come with 4.10s unless that changed since '12.
Some '07 non-Rubicons with the D44 rear came with a 4.10 ratio (pretty rare overall, much like the D35 equipped ones), but it ended there. The only way to get 4.10s now is to get a Rubicon, max is 3.73 in Sport/Sahara/Special edition of the month as far as I know

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