Speedo gear replacement... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevelle454 · 06-16-2007, 07:26 PM

My speedometer does not work on my 72 C20. The cable is okay. It does not spin when I drive down the road though. I have been told there is a plastic gear in the transmission (TH350) that can break then the speedo doesn't work. Is this true? If so, how do I replace it and where can I get a new one?

Thanks
Scott

cooters · 06-16-2007, 07:31 PM

GM has the gears but make sure the little housing that holds the gear is not worn out and allowing the gears to miss each other. The tranny output shaft also has a plastic gear which is servicable through the tailhousing

Chevelle454 · 06-17-2007, 02:03 AM

Any pics available?

06-16-2007, 07:26 PM	#1
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Speedo gear replacement... My speedometer does not work on my 72 C20. The cable is okay. It does not spin when I drive down the road though. I have been told there is a plastic gear in the transmission (TH350) that can break then the speedo doesn't work. Is this true? If so, how do I replace it and where can I get a new one? Thanks Scott __________________ 1972 C10 1972 C20

06-16-2007, 07:31 PM	#2
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: Speedo gear replacement... GM has the gears but make sure the little housing that holds the gear is not worn out and allowing the gears to miss each other. The tranny output shaft also has a plastic gear which is servicable through the tailhousing

06-17-2007, 02:03 AM	#3
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Re: Speedo gear replacement... Any pics available? __________________ 1972 C10 1972 C20



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