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05-22-2012, 02:12 AM
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#1 |
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Registered User
Join Date: May 2011
Location: melbourne australia
Posts: 128
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Speedo help
Iv'e just changed from stock wheels and tires to 20" rims with 35 profile tires, It's has 3.44 gears and a T350, The Speedo is out about 20 MPH , It has a Red Speedo Gear Any one know which color I should have?
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05-22-2012, 02:14 AM
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#2 | |
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Registered User
Join Date: May 2012
Location: Visalia CA
Posts: 118
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Re: Speedo help
Quote:
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05-22-2012, 02:59 AM
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#3 |
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Registered User
Join Date: May 2011
Location: melbourne australia
Posts: 128
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Re: Speedo help
No good, carn't load in 20" , The 20 MPH is fast
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05-22-2012, 03:03 AM
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#4 | |
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Registered User
Join Date: May 2012
Location: Visalia CA
Posts: 118
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Re: Speedo help
Quote:
sorry! |
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05-22-2012, 06:12 AM
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#5 |
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Registered User
Join Date: May 2011
Location: melbourne australia
Posts: 128
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Re: Speedo help
Great , thanks
Posted via Mobile Device |
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05-22-2012, 07:22 AM
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#6 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,178
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Re: Speedo help
I'd figure out how much you are off, in percentage (by pacing with a GPS) and then throw an external adapter on there -
http://www.partshp.com/speedometer_gears.htm K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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05-22-2012, 09:48 AM
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#7 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,933
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Re: Speedo help
Try this Excel 2003 Spreadsheet. It calculates RPM and Speedometer gear information including ratio adapters based on transmission, Transfer Case, axle ratio, & tire sizes.
__________________
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And please let us know if and how your repairs were successful. |
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05-22-2012, 09:53 AM
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#8 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Speedo help
Plug your info into this calculator. http://www.tciauto.com/tc/speedometer-gear-calculator
Change the drive and driven gear ratio until you find a combo to the closest whole number. You may have to change the housing if you change the driven gear too much. |
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