Find a section of freeway or whatever, that has measured markers on side of road. At 60 m.p.h with stopwatch should take a 60 sec.Then decide fast or slow. 55sec.=65mph,65sec.=55mph. The speedo gear is behind housing cable threads to on trans. Take bolt out and wiggle housing out. Count teeth,add teeth to slow speedo down,subtract to speed it up(trying to remember). Local GM dealer should have gears,maybe chart to get close. gooduck!
Speedo Question
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
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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