1. Home
  2. Jeep and Willys (new and old)
  3. speedo gears?

speedo gears?

I was clocking my speedometer the other day with my GPS (I have 31" tires and 4.56 gears on my 98 TJ SE) and I found that the speedometer was reading

64mph at an actual speed of 60mph (on the GPS). The SE came with a 40 tooth gear, so I calculated that I need a 42.666 tooth gear. ;) I figured I'd go conservative at 42 teeth. I called Jeep parts at three different dealerships and they all say that the gears go up to 41 teeth and that's it. Does anyone know where I can get a 42 tooth gear? 41 is hardly worth the money to put it in. That's around a 1.5 mph correction. TIA TJim
Reply to
TJim
Loading thread data ...

Just curious What is the accuracy of a GPS? I own a GPS And I think I remember reading that there is a tolerance.

+/- someth> I was clocking my speedometer the other day with my GPS (I have 31" tires
Reply to
FrankW
*Everything* has a tolerance of +/- *something*... ;)
Reply to
TJim

Reply to
L.W.(ßill)

I know, Bill, but the chart is wrong for the SE as far as I know. My SE came with 29" tires and 4:11 gears and had a 40 tooth gear in it. The chart shows a 38 tooth. If I'm reading 64mph at 60mph and I have a 40 tooth gear, The speedometer cable is turning too fast and I need a larger gear. 40 * 64 / 60 = 42.67 teeth. TJim

Reply to
TJim

Reply to
L.W.(ßill)

Looks good, Bill. The only thing I find distracting is the "Go Jeep" flag on the mouse pointer, although, I never lost the pointer the whole time I was checking out the page. ;) So, it seams that, although I need a 42 tooth gear, the biggest one available is 41 tooth, right? Rats. Good thing I don't have bigger tires... TJim

speedometer

Reply to
TJim

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.