Stock gear ratio...

[liljohn850]

So I was under the impression I had 3.21 gears. Stock. Non towing package. 17's. But today, my flash cal came in. Plugged 'er up and low and behold the gear ratio it pulled off the ecu was 3.73. So... I changed it to 3.21. And now I'm questioning that. Should I trust the flash cal and go back to 3.73? Or stay in belief I have 3.21s...

On a side note. My mpg went up 5 right off the bat. (According to my trusty gauge and vehicle info system)


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[AllAmericanInfidel]

Check your diff cover, there should be a tag or marking that states what gears you have. The only way I can see this not being correct is if you bought it used and the previous owner swapped gears without changing the tag??

 

[liljohn850]

Check your diff cover, there should be a tag or marking that states what gears you have. The only way I can see this not being correct is if you bought it used and the previous owner swapped gears without changing the tag??

rear
front.



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[seanb123]

Safest way is to raise the jeep and spin the wheel if the drive shaft spins just over 3 times per wheel spin it's 3.21 if almost 4 spins 3.73

 

[liljohn850]

Safest way is to raise the jeep and spin the wheel if the drive shaft spins just over 3 times per wheel spin it's 3.21 if almost 4 spins 3.73

Thanks. That's what I'm gonna do after the minion goes to bed.


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[AllAmericanInfidel]

Dana Axle Tags

Chrysler reserved the Dana axles for its more rugged line of Jeeps, such as the Wrangler Rubicon or the luxury-oriented Grand Cherokee among other bigger models. Typically, older models had a metal tag attached to the axle cover. The newer versions, such as the 2010 Wrangler Rubicon, have a black label affixed to the axle tube. The 2010 models have no metal tag to identify the rear axle ratio. Some models, such as the 1999 Jeep Grand Cherokee, will have the data, including rear axle ratio, stamped into the axle tube.
Read more: http://www.ehow.com/info_12228089_jeep-axle-tag-information.html#ixzz2q3HHCIMT

According to this, there is a label that IDs the gear ratio, but that will only help you if you know for a fact it is stock. Your best/safest bet will be to tae Sean's advice so you know for sure.

 

[liljohn850]

Dana Axle Tags

Chrysler reserved the Dana axles for its more rugged line of Jeeps, such as the Wrangler Rubicon or the luxury-oriented Grand Cherokee among other bigger models. Typically, older models had a metal tag attached to the axle cover. The newer versions, such as the 2010 Wrangler Rubicon, have a black label affixed to the axle tube. The 2010 models have no metal tag to identify the rear axle ratio. Some models, such as the 1999 Jeep Grand Cherokee, will have the data, including rear axle ratio, stamped into the axle tube.
Read more: http://www.ehow.com/info_12228089_jeep-axle-tag-information.html#ixzz2q3HHCIMT

According to this, there is a label that IDs the gear ratio, but that will only help you if you know for a fact it is stock. Your best/safest bet will be to tae Sean's advice so you know for sure.

It's def stock. I bought it from a rental car place. Thanks!! I'll look into that


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[Beyrgut]

Go here Jeep Cares and request the build sheet. It normally takes less than 48 hours to get the email.