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Hey guys...I have a question on the gearing of my differentials on my '12 JKU. The sticker says it is equipped with 3.21 gearing, but I also have the max tow package. Since i have the max tow package does that means it automatically comes with 3.73 gears even tho sticker says 3.21? I have heard contradicting info on this. Thanks in advance for the help.
 

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Hey guys...I have a question on the gearing of my differentials on my '12 JKU. The sticker says it is equipped with 3.21 gearing, but I also have the max tow package. Since i have the max tow package does that means it automatically comes with 3.73 gears even tho sticker says 3.21? I have heard contradicting info on this. Thanks in advance for the help.
I think the difference might be auto vs manual tranny for the gears you get with tow pak
 

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the only way to know 100% is to jack up the rear end and spin it by hand.

or you could check your build sheet, never heard of them being wrong.
 

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pretty sure the max tow package comes with 3.73's while the tow package does not. Seems like it would say on your window sticker what is included with the max tow package.
 

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It should be on the options side if you got 3.73 or 4.10.
4.10's are only available in Rubicons, standard on manual trannies and optional on autos.
 

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Crawl under your jeep. Take a mirror, look on the very top of the axle. There is a paper stuck there with your axle's build of material number. I've attached a pic of mine. Go to the spicer website, find the e-catalogue, and key the number in. It will give you the ratio, part numbers of gears, bearings, install kits etc. You can use the gear numbers in another location to find a different ratio set which will fit the same carrier. Kinda interesting if you like that stuff. The number to use in this case, shown in the mirror is 2011958-1
 

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4.10's are only available in Rubicons, standard on manual trannies and optional on autos.

This is wrong information.

I picked up an 07 JKU Sport that has factory 4:10's per the build sheet from Jeep.
 

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This is wrong information.

I picked up an 07 JKU Sport that has factory 4:10's per the build sheet from Jeep.
waaaaaaay back in 07 this was possible. OP is talking about a 3.6
 

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This is wrong information. I picked up an 07 JKU Sport that has factory 4:10's per the build sheet from Jeep.
Anything can be special ordered however, in 2007 anything whether X (sport) or Sahara with a tow package automatically had 4.10.
In 2008 to 2011 all Sahara's had 3.73 auto and manual.
X or Sport manual had 3.21 auto had 3.73.
2007-2011 Rubicon all standard with 4.10.

2012-present
Rubicon standard equipment 3.73 with 4.10 optional.
Sahara standard equipment 3.21 with 3.73 in tow package or optional
Sport standard equipment 3.21 with 3.73 optional.
 

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My son has an 07 Sahara 2dr with 4.10.
My 08 with tow package has 3.73.
My daughters 09 has 3.73 w/o tow package
 

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Yup, 07 was a transition year. There were also a number of early 07's that had D35 rears.
^^^Yep, the famous D35. Shock load it and the axles would possibly break off at the side gears. Very poor design...IMO
I had the D35 in my 2003 TJ, and I was always concerned when running off road, that just maybe...:atomic:
 
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