Speedometer correction
Post Fiend
Joined: Jul 2004
Posts: 8,786
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From: Northern California
Originally Posted by webster
I had to replace the drive gear in the transfer case; worn out. Then the odmeter was right on but the needle read about 5mph fast. I found an adjustment lever in the speedometer itself. Works sort of like a watch spring. Getting it zeroed 
in now. I found the parts I needed from Drivetrain.com out of Vegas. Ford dealers just wanted my credit card. No help at all.
in now. I found the parts I needed from Drivetrain.com out of Vegas. Ford dealers just wanted my credit card. No help at all.You can correct the speedometer to read exactly right using that "watch spring", but your odometer would still be off if it was originally. etc...
Freshman User
Joined: Jan 2006
Posts: 32
Likes: 0
Het guys, I have an 81 F-150. with stok tre size that should be 215-75 15. I bought the turck with 31x10.50 15's. I noticed when I was driving it home that ithe speedo wasd off. I was showing 60 and everyone else was passing me like I was on jacks. I now have 235-75 15's on it, the stock size on my scrapped 81 f-100. How far off will my speedo nbe now? Thanks for the help.
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Posting Guru
Joined: Oct 2004
Posts: 1,229
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Find a place that has markers, and watch your odo as you drive. When you hit the next mile marker see how far off your odo is... It will be in 10ths of a mile.. So if you do that and you travel .8 of a mile, instead of 1 mile. your 20 percent off. So you just go from there. If you want to find out about finding a new driven gear, read through this thread. There is alot of good information ..Eventually.. 
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