How do I recalibrate my speedometer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*chevytruckfan* · 07-17-2004, 02:34 PM

I have a TH350 transmission with an open diff 12bolt with 3:73 ratio gears. I don't know what size the speedo driven gear is, but the original speedometer in the truck is about 20MPH faster than what it should be.

*Gee_Emm* · 07-17-2004, 02:48 PM

You can change the gear in the tranny that the cable hooks up to

http://www.tciauto.com/tech_info/speedo_gears.htm

http://members.core.com/~faldrich/speedo.htm

http://www.sccoa.com/faq/speedgr.html

oldtrucknut · 07-17-2004, 04:20 PM

you should be able to take your speedo gear out, take it to a transmission shop, tell them what you posted here, and they should be able to take care of it for you easily

07-17-2004, 02:34 PM	#1
chevytruckfan Account Suspended Join Date: May 2004 Location: Lake Placid, Florida Posts: 930	How do I recalibrate my speedometer I have a TH350 transmission with an open diff 12bolt with 3:73 ratio gears. I don't know what size the speedo driven gear is, but the original speedometer in the truck is about 20MPH faster than what it should be.

07-17-2004, 04:20 PM	#3
oldtrucknut 67-72 truck surgeon Join Date: Jul 2003 Location: Indiana Posts: 155	you should be able to take your speedo gear out, take it to a transmission shop, tell them what you posted here, and they should be able to take care of it for you easily __________________ 1969 Chevy C10 1993 Toyota Camry LE 1999 Ford F250 Super Duty 4x4 diesel 2008 Dodge Charger Super Bee 1953 International R182

07-17-2004, 02:48 PM	#2
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 3,991	You can change the gear in the tranny that the cable hooks up to http://www.tciauto.com/tech_info/speedo_gears.htm http://members.core.com/~faldrich/speedo.htm http://www.sccoa.com/faq/speedgr.html



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