Speedo Correction
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Freshman User
Joined: Apr 2005
Posts: 47
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From: Rock Hill, SC
Speedo Correction
I have a 1988 F150 5.0 C6 4wd 3.55 gears. I just swapped out the stock 235/75/15 tires for 31 10.5 15's. does anyone know what gear I need to get to make my speedo close to accurate?
Elder User
Joined: Jan 2008
Posts: 589
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From: Stockton Ca.
Pull the cable and driven gear, look at the end of the driven gear and count the number of teeth. Most will say a 1 tooth change will account for about a 3mph reading change.
I prefer to have a freind with an accurate speedo drive at 50mph, then look at my speedo to figure out how far I'm off. If his shows 50mph and I show 40mph I'm off by 20%, gives you a better idea of how your driven gear tooth count needs to be changed.
I prefer to have a freind with an accurate speedo drive at 50mph, then look at my speedo to figure out how far I'm off. If his shows 50mph and I show 40mph I'm off by 20%, gives you a better idea of how your driven gear tooth count needs to be changed.