Does this affect speedo - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Billy Porter · 11-12-2002, 09:23 AM

I switch from to a automatic from a 3speed....... Will this affect my speedometer.......... It seems as if it is off by 10-15mph also have 275-60 15 tires?
thanks

*Piston* · 11-12-2002, 09:28 AM

The driven gear and the drive gear (both inside the transmissions) could be and probably are different.

Pull the speedometer gear housing out and note the color of the driven gear. If the gear in your old transmission looks ok, swap it with the one you have now. Thats how they adjust the speedo for different gear/tire combinations.

11-12-2002, 09:23 AM	#1
Billy Porter Registered User Join Date: Jan 2000 Location: Petersburg, Virginia Posts: 178	Does this affect speedo I switch from to a automatic from a 3speed....... Will this affect my speedometer.......... It seems as if it is off by 10-15mph also have 275-60 15 tires? thanks __________________ 71 GMC Stepside 250/350 Turbo better known as "Fred Sanford 77 240 Mercedes Benz 92 300E Mercedes Benz 70 Firebird 400 85 600 Ninja

11-12-2002, 09:28 AM	#2
Piston Account Suspended Join Date: Oct 2002 Location: Olathe, KS Posts: 2,301	The driven gear and the drive gear (both inside the transmissions) could be and probably are different. Pull the speedometer gear housing out and note the color of the driven gear. If the gear in your old transmission looks ok, swap it with the one you have now. Thats how they adjust the speedo for different gear/tire combinations.



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