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Old 04-29-2012, 03:17 PM   #1
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3.73 rear axle ratio

I just bought a new Sport Unlimited. The dealer assures me it has a 3.73 rear axle and I just want to verify as I specifically requested it. The left side of the window sticker says under "Standard Equipment" that a 3.21 rear axle ratio is standard. On the right side of the window sticker it states under the 5-speed automatic w5a580 transmission option "hill descent control, 3.73 rear axle ratio". The vehicle also comes with Trac-Lok limited slip differential, but does not have a tow package. Here is the confusion, I have read elsewhere that the 3.73 rear axle ratio option is a separate option costing $45. This price is not listed on the sticker next to where it states "3.73 rear axle ratio". I am fairly sure it is included because I don't know why else it would list it. Is this option now part of the automatic transmission option? Any help would be greatly appreciated.

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Old 04-29-2012, 03:25 PM   #2
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Request the build sheet from your dealer not the window sticker.

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Old 04-29-2012, 03:43 PM   #3
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Go to jeeps website and enter the vin, you can see the build sheet there.
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Old 04-29-2012, 03:48 PM   #4
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Another thing to check it the diff covers. There usually is a little metal tag bolted to the diff cover with 2 bolts that will tell you what gear ratio it is.
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Old 04-29-2012, 03:53 PM   #5
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Quote:
Originally Posted by lolpetewtf View Post
Go to jeeps website and enter the vin, you can see the build sheet there.
I would do this. However, you have it.
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Old 04-29-2012, 04:03 PM   #6
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I would think you would be able to tell just by driving it. To me there was a big difference between 3.21 and 3.73.
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Old 04-29-2012, 04:16 PM   #7
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I logged on to the Jeep website and the good news is it lists the 3.73 axle ratio. On another note, the window sticker lists a "368w 7-speaker Infinity sound system including Subwoofer" that cost $395, but the Jeep site only says 6 speaker Infinity sound system. Any idea on this inconsistency?
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Old 04-29-2012, 04:23 PM   #8
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Where did you find this? I have been looking all over the site and I can't find it.

I went into the owners section to register my car online and it says it was already register. Maybe the previous owner register it and now I can't. But I still can't find the build sheet.
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Old 04-29-2012, 04:35 PM   #9
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I had to register first
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Old 04-29-2012, 04:59 PM   #10
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Quote:
Originally Posted by Mig888 View Post
I logged on to the Jeep website and the good news is it lists the 3.73 axle ratio. On another note, the window sticker lists a "368w 7-speaker Infinity sound system including Subwoofer" that cost $395, but the Jeep site only says 6 speaker Infinity sound system. Any idea on this inconsistency?
I'm not sure we're you're looking. Under Build Your Own for the Sport S, the option is listed as: "368W 7-Speaker Infinity® Sound Sys Incl Subwoof," then under Option Details:
368-watt 7-speaker Infinity® sound system including subwoofer. Infinity is a registered trademark of Infinity Systems, Inc.
Under the Sport S specs, it says:
PREMIUM SOUND
Surrounded by nature and music. An Infinity® Premium Sound System has seven speakers, including a subwoofer and a 368-watt amplifier that will make your favorite songs sound even better.
Still consistent, though it should probably be made clear that it's an option on the Sport S.

I haven't gone through the whole site, I'm sure; but the only references I see to a 6-speaker system are to the standard, non-Infinity system.
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Old 04-29-2012, 05:03 PM   #11
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I guess I will have to try to count the speakers in my car. Anyone know where the sub would be located?
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Old 04-29-2012, 05:30 PM   #12
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I guess I will have to try to count the speakers in my car. Anyone know where the sub would be located?
In the back cargo section....should be a plastic box with a speaker in it...you can't miss it.
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Old 04-29-2012, 05:44 PM   #13
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Originally Posted by superdavis78 View Post
In the back cargo section....should be a plastic box with a speaker in it...you can't miss it.
Yup, in the right rear corner of the cargo area just in front of the tailgate.
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Old 04-29-2012, 06:38 PM   #14
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Quote:
Originally Posted by adawg38 View Post
Another thing to check it the diff covers. There usually is a little metal tag bolted to the diff cover with 2 bolts that will tell you what gear ratio it is.
Not on JK's.
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Old 04-29-2012, 06:47 PM   #15
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Another, direct way to tell... (assuming you still have the stock 29" tires)

At 60 MPH:

3.21 = 1850 RPM

3.73 = 2150 RPM
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Old 04-29-2012, 07:48 PM   #16
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I think the 3.73 was a new no cost option for 2012. Mine was the same way.
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Old 04-29-2012, 08:34 PM   #17
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Here in Canada a 3.73 rear axle ratio is a $75.00 option.
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Old 04-30-2012, 12:04 PM   #18
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Its a $75 option in the states also
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Old 04-30-2012, 12:33 PM   #19
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I think the 3.73 was a new no cost option for 2012. Mine was the same way.
There were a bunch of 2012's that had 3.73's on the Sahara's and Sports at no cost (and without tow packages) instead of the normal $50 charge on the window stickers. That started sometime during winter.

Another one of those Chrysler unknowns. Some had it, some didn't.

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