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Old 11-02-2007, 09:41 PM   #1
Ace in the hole
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Speedometer adjustment

Is there any way to adjust the speedometer in 4x4 trucks for different size tires or gearing changes?

Got my NP205 transfer case apart and was looking at the speedo drive gear and it got me wondering about how accurate the speedometer will read when I go to larger tires.
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Old 11-03-2007, 12:40 AM   #2
earl87gta
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Re: Speedometer adjustment

you have to change the speedo drive gears you should be able to go to napa and get a set.
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Old 11-03-2007, 07:34 AM   #3
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Re: Speedometer adjustment

That's good to know. How do you figure out what you need though?
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Old 11-03-2007, 09:24 AM   #4
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Re: Speedometer adjustment

I know there are calculators out there for it but I dont have one handy.
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Old 11-04-2007, 02:22 AM   #5
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Re: Speedometer adjustment

I'm preretty sure... in fact I know that there is such thing as an inline ratio changer. instead of changing the gears on the inside of the t-case this miniture gear box screws into your T-case and your speedo cable screws into that. I can get pics if you need...
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Old 11-04-2007, 06:57 AM   #6
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Re: Speedometer adjustment

cool, I went ahead and put my xfer case back together for now but an inline adapter would be cool. where do you find them?
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Old 11-04-2007, 07:59 AM   #7
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Re: Speedometer adjustment

http://www.tciauto.com/Products/Tech...eedo_gears.asp
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Old 11-04-2007, 09:32 AM   #8
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Re: Speedometer adjustment

I see speedo gears for automatics on that site but how about manuals?
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