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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?
You might have better luck asking in the 87-96 forum, more people there. There's a guy in
the 80-86 forum named uncle.stosh who'd probably know but he's only sometimes online.
You might search through the 80-86 forum (use the advanced search feature) and see if you
can find an archive of his posts where he's talked about that stuff.