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Speedo Question

1254 Views 4 Replies 5 Participants Last post by  DZAUTO, 
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I know this was answered before, but I can't manage to find it on the site so here goes

I changed my tranny from a pg to a TCI th350. In addition, the tires went from whatever the heck was on the car originally (not stock) to 15" rims with 275s on 'em. I know the speedo is off. How do I figure out how off my speedo is? Is it a function of just the tranny, or the tranny and the tires? How do I correct this (I know there are Speedo gears somewhere in the tranny (?) but where do I get new ones, or is this not my problem)? TIA--Amanda
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I paid the transmission shop to do this for me. They drive the car on a measured course (like the measured miles on the highway)and then they change the gear to one that they figure is close. Then they drive it again and and adjust accordingly.

Hope this helps,

Scott
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