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11-02-2007, 09:41 PM
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#1 |
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Registered User
Join Date: Apr 2007
Location: Kalamazoo, Michigan, USA
Posts: 538
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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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1970 K20, 350--- SOLD 05 silverado extended cab short box- duramax Jeep wrangler unlimited |
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11-03-2007, 12:40 AM
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#2 |
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Senior Member
Join Date: Dec 2003
Location: Kingsport TN
Posts: 4,641
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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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Earl 68 2500 4x4 GMC Burb Last edited by earl87gta; 11-03-2007 at 12:40 AM. |
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11-03-2007, 07:34 AM
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#3 |
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Registered User
Join Date: Apr 2007
Location: Kalamazoo, Michigan, USA
Posts: 538
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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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1970 K20, 350--- SOLD 05 silverado extended cab short box- duramax Jeep wrangler unlimited |
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11-03-2007, 09:24 AM
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#4 |
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Senior Member
Join Date: Dec 2003
Location: Kingsport TN
Posts: 4,641
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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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Earl 68 2500 4x4 GMC Burb Last edited by earl87gta; 11-03-2007 at 09:24 AM. |
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11-04-2007, 02:22 AM
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#5 |
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Registered User
Join Date: Apr 2007
Location: Kelso, WA
Posts: 363
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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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1972 K10 4" lift, 35’s, 383 stroker, 700r4, current project. 1971 C10 3"/5" static drop, 355/350. "La Bamba.” The current daily driver. |
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11-04-2007, 06:57 AM
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#6 |
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Registered User
Join Date: Apr 2007
Location: Kalamazoo, Michigan, USA
Posts: 538
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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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1970 K20, 350--- SOLD 05 silverado extended cab short box- duramax Jeep wrangler unlimited |
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11-04-2007, 07:59 AM
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#7 |
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Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Speedometer adjustment
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11-04-2007, 09:32 AM
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#8 |
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Registered User
Join Date: Apr 2007
Location: Kalamazoo, Michigan, USA
Posts: 538
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Re: Speedometer adjustment
I see speedo gears for automatics on that site but how about manuals?
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1970 K20, 350--- SOLD 05 silverado extended cab short box- duramax Jeep wrangler unlimited |
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