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Unread 06-27-2008, 08:16 AM   #1
PSYCH0
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Gear Ratio from Factory?

Is there any logical mapping of gear ratio to vehicle from the factory?

Example:
2006 Jeep TJ
4.0
6-Speed
No Tow Package

What gear ratio would come with this from the factory? (If it wasn't a special order)

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Unread 06-27-2008, 08:24 AM   #2
zband
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My bet 3.07's. You can always use your vin to figure to out from the Jeep site.
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Unread 06-27-2008, 08:25 AM   #3
BYuen
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This can be your friend:
http://www.jeepforum.com/forum/showp...04&postcount=9



EDIT: Most certainly you have 3.07s with a D35 and 6cyl. You can also check on the diff cover there should be a tag with the gear ratio on it.
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Unread 06-27-2008, 08:29 AM   #4
otisdog
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If it has a D44 rear axle it will be 3.73's.
Otherwise look on this tag it could be 3 07 or 3 73

Jim
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Unread 06-27-2008, 09:25 AM   #5
PSYCH0
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Perfect... and yes I do believe it's 3.07

Jeep isn't here now so I couldn't check the diff or I would have.. thanks!
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Unread 06-27-2008, 09:31 AM   #6
Jerry Bransford
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Whether a D35c has a 3.07 or 3.73 is not up to the factory, it's how the dealer orders it. I used to have a bunch of Jeep dealers as customers and whether the lot had mostly 3.07 or 3.73 equipped TJs depended on if the person ordering their Jeeps knew wtf they were doing. Most had no idea what difference it made other than 3.07 supposedly gives better mileage. It was frustrating to go onto their lots looking for new Jeeps to customize with lifts and bigger tires and find the best colors had 3.07 ratios which made them unusable for the 33" tires I usually set their Jeeps up with.
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Unread 06-27-2008, 09:56 AM   #7
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Didn't know that Jerry... good information! I aways 'assumed' the dealer didn't go that 'deep' into the options when they ordered them unless the customer specified they wanted something like a specific gear ratio. Like you said they don't know wtf their doing in these areas.... they should be sticking to hard top vs soft top and auto vs manual...
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Unread 06-27-2008, 10:01 AM   #8
zband
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anyone interested here are the dealer codes (at least for 2003) for the axles and their gearing.

[BGA]=Brakes - Power Front Disc/Rear Drum
[BGK]=Brakes - 4-Wheel Anti-Lock
[BRW]=Brakes - 4-Wheel Disc
[DME]=Axle Ratio - 3.73
[DMF]=Axle Ratio - 4.11
[DMM]=Axle Ratio - 3.07
[DMU]=Axle Ratio - 4.56
[DRJ]=Axle - Rear,Dana M35/194MM
[DRK]=Axle - Rear,Dana 44/226MM
[DSA]=Axle - Trac-Lok Differential
[DSE]=Axle - Trulok Differential

I'm not sure if they change these codes much from year to year.
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Unread 06-27-2008, 10:07 AM   #9
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Quote:
Originally Posted by BYuen View Post


EDIT: Most certainly you have 3.07s with a D35 and 6cyl. You can also check on the diff cover there should be a tag with the gear ratio on it.
when i bought my X it had a 6cyl, D35 and 3:73
so dont be so sure on the 3:07gears
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Unread 06-27-2008, 10:17 AM   #10
outdoorlivin247
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A good rule of thumb on a factory never been touched is the canyon wheel came w/ the OR package and should have a 44 rear w/ 3.73...
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Unread 06-27-2008, 10:22 AM   #11
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My Tj came with the canyon wheels, and a D35c and 3.07s. Im not saying they all came that way but like Jerry said it really depends on what the dealer threw together.
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Unread 06-27-2008, 11:39 AM   #12
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Quote:
Originally Posted by outdoorlivin247 View Post
A good rule of thumb on a factory never been touched is the canyon wheel came w/ the OR package and should have a 44 rear w/ 3.73...
OR package? Do you mean off-road?

If so, there was never an off-road package.
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Unread 06-27-2008, 02:34 PM   #13
outdoorlivin247
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When most dealers order cars, trucks or Jeeps the use convenience groups...My brother in law worked @ a jeep dealer for years in F&I and ordered most of the vehicles for the dealership...He told me that the order group that had the canyon wheels had the Dana 44 and 3.73 gears in it...But as Jerry said it is up to the dealer or the person ordering the jeep to choose what it has...
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Unread 06-27-2008, 03:29 PM   #14
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I've got an 06 4.0l tj x 6 speed and found my tag on the front diff cover showing 3.07. I had a bunch of random numbers on the tag at the rear. It's a 35 rear and 30 front
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Unread 06-28-2008, 06:09 AM   #15
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How are the 3.07's working with the 33" tires?
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