Which speedo gear, yeah I've seen the chart, tooth question

SyCo · Mar 31, 2004

I'm running 30" MT/Rs on my 98 4.0 5 speed. I checked my speed with GPS, and it is off by approx 2MPH, but my dash speedo reads HIGHER than the GPS! So if the GPS says 45MPH, my dash speedo reads 47MPH. I've checked out the charts and everywhere I've read it says the dash speedo should be slower than actual speed when going to larger tires, but it seems this is not the case for me.

I haven't pulled the speedo gear yet to check the tooth count, but I was wondering if I needed to go with a higher or lower tooth count to compensate for the inaccurate faster-than-actual-speed speedometer.

Thanks.

96inprogress · Mar 31, 2004

Check it:

http://go.jeep-xj.info/HowtoSpeedoGears.htm

Colin

Eagle · Apr 1, 2004

SyCo said:
I'm running 30" MT/Rs on my 98 4.0 5 speed. I checked my speed with GPS, and it is off by approx 2MPH, but my dash speedo reads HIGHER than the GPS! So if the GPS says 45MPH, my dash speedo reads 47MPH. I've checked out the charts and everywhere I've read it says the dash speedo should be slower than actual speed when going to larger tires, but it seems this is not the case for me.

I haven't pulled the speedo gear yet to check the tooth count, but I was wondering if I needed to go with a higher or lower tooth count to compensate for the inaccurate faster-than-actual-speed speedometer.

Thanks.

More teeth

XJAlaska · Apr 1, 2004

Eagle said:
More teeth

:gee:

xxxj-va · Apr 1, 2004

I have a 34 tooth you can have for a six pack. :cheers:

PaulJ · Apr 1, 2004

You need whatever is closest to 4.5% more teeth than you have now.

SyCo · Apr 1, 2004

Thanks for the help guys, I'll see if I can't find what I need tomorrow.

Which speedo gear, yeah I've seen the chart, tooth question

SyCo

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96inprogress

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Eagle

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XJAlaska

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xxxj-va

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PaulJ

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SyCo

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