Speedometer Off - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**mr48chev** · 10-01-2010, 10:31 PM

If you have access to a handheld gps take the truck out and figure out exactly how far it is off. probably at 60 mph on the speedo. Then figure out what percentage you are off and after counting the teeth on the driven gear and matching the color of the drive gear you can figure out what gear set will give you the right speed. You can get them at a local transmission shop, your GM parts counter or online. This outfit has a lot of good info on their website. It will pretty well walk you through without any real guesswork http://www.transmissioncenter.net/sp...FQEziQod3SGNeQ

You have to scroll down not quite half way down the page for turbo 350 info and pieces.

10-01-2010, 10:31 PM	#7
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 16,391	Re: Speedometer Off If you have access to a handheld gps take the truck out and figure out exactly how far it is off. probably at 60 mph on the speedo. Then figure out what percentage you are off and after counting the teeth on the driven gear and matching the color of the drive gear you can figure out what gear set will give you the right speed. You can get them at a local transmission shop, your GM parts counter or online. This outfit has a lot of good info on their website. It will pretty well walk you through without any real guesswork http://www.transmissioncenter.net/sp...FQEziQod3SGNeQ You have to scroll down not quite half way down the page for turbo 350 info and pieces. Last edited by mr48chev; 10-01-2010 at 10:34 PM.



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