I bought a new speedo gear since I went up to 33's. I bought one off of quadratec and when I went to get it installed the mechanic said it was to small and wiggled around. So i returned it and went to the dealer and ourdred another one. Of course it was the same size. I asked about it and they all said that was the right size even though I didnt need it b/c I have to reset the computer. I told them I dont have a rubicon, I have an 05 X and they said that they have computers in them. The manager asked two different mechanics and they both said I have a computer. I couldnt believe the Jeep mechanics didnt know that the rubicon has a computer, not an X. So i dont know who to trust anymore, well actually I only trust you guys now. Anyways, should the 32 tooth speedo gear fit a certain way or do I need to get something else to make it fit since it is smaller than a stock one?
I put the new speedo gear in myself and everything went smoothly. Except now my speedometer DOESNT MOVE! Due to the decrease in size of the new speedo, its not catching anything. HELP! I followed the instructions to the T.
I am by no means an expert on this subject, but I was under the impression, from some mechanics at Chrysler, that the speed was calibrated by the computer on the newer Wranglers. I do not think it is only the Rubicon that is done that way. From what I was told, they calibrate your tire size, with gear ratio, type of tranny, type of t-case.
Your whole engine is run by a computer, PCM. Any fuel injected engine has to have a computer. The one I put in my YJ, is a ECM, which just controls engine functions. The newer ones have the PCM's which is, Powertrain control Module. That is how I understand it. The OBDII data link connector, should be under your dash on the drivers side.
Well I got some GOOD news!! I had to twist the case just a tad more than I did. I went back and perfectly lined 26-31 with the raised dot and the speedometer moves!! I was off by a tad before. Except when I took ity out again, quite a bit of fluid came out, not a few drops. Do i need to worry about this? It wasnt anything more than a couple sheets of paper towel could clean up. I am quite excited even though this is one of the easiest things to fix I guess. Thanks for all of your help guys.
That is great........take it for a spin, and see if it works. I would like to know if it can still be manually changed like that.
You can check the level of fluid on the side of the case, by removing the bolt near the top, and seeing if you can touch the fluid with your pinky.
All cars and trucks have computers. they started using computers in the late 80's if i remember correctly. Like blu said if its got fuel injectors it has a computer. I cant think of a car today that is sold new that doesn't have one!!! this is silly! Someone correct me if im wrong...
The thing that concerns me the most is the fact that you said the speedo gears are different in size. Please check out this web page, you will see the gears are the same size. Also, it is a 98 model TJ. See what you think, BlueBoy.
The stock speedo gear is bigger than the new one I installed, much bigger. You must twist the case to make sure the tooth count on your speedo matched the range on the casing. So far so good, but I havent taken it on the highway to do the 60 mph test yet.
Fellas, I believe that it's only the 242 case in the Rubicon model that handles speed calibration by the PCM (I could be wrong, but I don't think so). All 231 cases will have the speedo gear on them. Except mine because I run the Tera ESS SYE and it uses a tone ring now that if I should want to calibrate mine I would have to by a control module from Skyjacker for a hundred bucks (not worth it)
President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats