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06-19-2010, 11:23 AM
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#1 |
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Registered User
Join Date: Mar 2010
Location: Calgary, Alberta, Canada
Posts: 10
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Speedo Cable Driven Gear
Wow! This one hurts my head. My 69 c-10 speedo is reading way too fast. I know the gear ratio (3.07) and the tire diameter (29") but how do I know which speedo cable driven gear to get without taking apart the transmission to look at the drive gear.
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06-19-2010, 12:43 PM
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#2 |
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Registered User
Join Date: May 2010
Location: Wallingford, PA
Posts: 186
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Re: Speedo Cable Driven Gear
I have the same problem and I searched a little. This link may help but you need to know the drive gear as well.
http://www.tciauto.com/Products/Tech...eedo_gears.asp This may help if you want to estimate it without knowing the drive gear. I haven't done it yet though. http://www.tciauto.com/Products/Tech...eedo_gears.asp If you try the estimating method let me know how it turns out. Dan |
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06-19-2010, 01:09 PM
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#3 |
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Registered User
Join Date: Mar 2010
Location: Calgary, Alberta, Canada
Posts: 10
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Re: Speedo Cable Driven Gear
Thanks, I will give it a try. If I get the existing driven gear teeth qty, which is easy, I can calc the driven gear teeth. THX again.
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06-19-2010, 03:08 PM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,736
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Re: Speedo Cable Driven Gear
Here's what I did. Had the wife drive ahead of me at 100kmh. My speedo said I was going about 125kmh(converted). I was about 25% to fast. Bought a ratio adaptor off ebay for 60 bucks that was 27% adjustment. Works good and didn't have to tear into the tailhousing. Pic included. It's the little squarish thing in the pic.
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