Stock JK gearing 3:21 vs 3:73 max tow option - JeepForum.com
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Unread Today, 02:36 PM   #1
jeepwrnglr92
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2013 JK Wrangler 
 
Join Date: Feb 2007
Location: WPB FL
Posts: 1,917
Stock JK gearing 3:21 vs 3:73 max tow option

I am sure this has been discussed but I am not really up on my gears. I ordered my Jeep yesterday and I only have a few days to change my mind on any options. So I could use some constructive feed back from people with 3:21 and 3:73 gears.

1. My 2013 JK 2 door has 3:21 and gets 20MPG average. Tows what 1200 or 1500 LB.
2. The dealer said the 3:21 and the 3:73 in the JKU gets the same millage. Hows can this be?
Programming in the trans?
No extra coolers or anything else added. I have a trailer hitch already but it comes as part of the package. So I am only really getting gears for $660 from the factory.

I rented a JKU for 2 weeks and got 20 average but I am sure it had 3:21 being a rental.

3. The dealer said the front gears are 3:21even with a 3:73 rear end. I thought you had to have matching gears front and back.

4. I don't tow much but want the ability to pull a 5500 lb boat 1/4 mile from the ramp one or twice a year for service. I know the max tow is rated for 3500 but i don't think a 1/4 mile will hurt it one or twice a year.

5 Can I pull the boat with a 3:21 rear?


Anyone have actual real world mpg numbers on the 3:21 and 3:73 stock Jeeps?
Please don't tell me to search. I did and I am still confused. Its a 660$ option so I want to be sure if I need it fine. If not Ill kill it.

I want good MPG as this is a street daily driver for me. Maybe some day more than that but downsizing to 1 car for a while. I drive 60+ miles a day so mpg is important to me. And Yes I know its a brick with an engine but I happy with my 20 to 21 on the 2 door now.

Thank oyu all in advance for your help on this.

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Unread Today, 02:46 PM   #2
222Doc
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2012 JK Wrangler 
 
Join Date: Sep 2011
Location: Lake Havasu City, AZ
Posts: 4,642
gears must match that dealer should know better. Unless you need tow more or going to larger tires might as well stay with what you have. Our 4.1 rubi when stock got 19mpg at 70.
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Unread Today, 05:10 PM   #3
jeepwrnglr92
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Join Date: Feb 2007
Location: WPB FL
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so you are saying stay with 3:21? thats what my 2013 has or are you saying go with 3:73 for the 2015?
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Unread Today, 05:16 PM   #4
Eagles77
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Join Date: Feb 2013
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Go with 3.73 or 4.10 if you can!!!
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Unread Today, 09:02 PM   #5
pentastarguy
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2012 JK Wrangler 
 
Join Date: Dec 2011
Location: sussex, new jersey
Posts: 5,471
you are not going to 5500 lbs legally with any two door wrangler. 4 door max tow is 3000. lbs. "i believe. imho, you are looking at the wrong vehicle if you need to tow that weight.
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