I need a new gear since we put the 33's on my TJ, anyone know the specifics on what I need w/3.73's? Rick says there's a shop down in Riverside that sells the things, or should I go to the local dealership since it's muuuch closer?

TJ Speedo Gear Chart
Tire | 38" |37" | 36"| 35"| 33"| 32"| 31"| 30"
R&P
5.13 | 38 | 39 | 40 | 41 | 43 | 45 | 46 | 48
4.88 | 36 | 37 | 38 | 39 | 41 | 43 | 44 | 46
4.56 | 34 | 35 | 36 | 37 | 39 | 40 | 42 | 43
4.11 | 31 | 32 | 33 | 34 | 36 | 37 | 38 | 40
3.73 | 27 | 28 | 28 | 29 | 31 | 32 | 33 | 34

To arrive at a correct Jeep part number add the tooth count for the speedometer gear to the end of 520676. For a 26 tooth gear the correct part number is: 52067626

Originally posted by sarah
I need a new gear since we put the 33's on my TJ, anyone know the specifics on what I need w/3.73's? Rick says there's a shop down in Riverside that sells the things, or should I go to the local dealership since it's muuuch closer?

I paid $10 at the dealer.

ooo! rockin' guys, thanks for the help.

Originally posted by sarah
ooo! rockin' guys, thanks for the help.

No prob! I need a 39 tooth if anyone has one lying around.
Thanks
:8

Originally posted by Dukes69
No prob! I need a 39 tooth if anyone has one lying around.
Thanks
:8

i need a 31 :D

I've got a 40 tooth if anybody wants it

Originally posted by igofshn
I paid $10 at the dealer.

I had to pay $300 for a "tuning computer" to recalibrate a Chevy truck's speedo for 33".

If only changing gear ratios was so cheap....

Sarah,
The speedo gear that is in my Jeep right now is what you need . . . 33's and 3.73's. You can have it once I get/find a 39 tooth. I need a 39 tooth in trade! :D

Quick Calc for speedo gear go to

www.jeeptech.com/javaAps/Speedo.html

How do I know what size gears I have in my Diff's

If you look at the cover of your rear diff, there should be a little metal tag on one of the bolt heads stamped with your gear ratio.




Buy your Speedo gears here - Macromotive.com (http://www.macromotive.com/shopping/goShopping.cfm?tag=4.0.0.0.3529.22174&retag=3.1&area=4)

Ok I got a question. I installed the 241OR rubicon T-case in my TJ, how do you recalibrate this speedo? T-case doesnt have the gear like the 231. Any rubi owners get past this.

I bought a dakota digital recalibration unit but I havent figured out how to use it.

I believe you have to have the PCM calibrated. I have heard that the speedometers read fast in the rubicons (mine included). People are going to the dealer to have them reprogrammed. Mine reads about 3 or 4% fast, which would be just about right if I were to put 33's on it. I don't know if that calibration is will help you though, since you are still using your original PCM, not one from a rubicon.