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#64285 08/15/2006 5:33 PM | Joined: Apr 2006 Posts: 236 'Bolter | | 'Bolter Joined: Apr 2006 Posts: 236 | Originally posted by bigbadswingdaddy: On the left coast we have mile markers on the highways. Simply drive the truck on the freeway and look for a marker. At 60 mph, it should take you 1 minute to get to the next marker. Bring a stopwatch. you can also check the accuracy of your odometer. I think a variation of + or - 5% should be acceptable. If you have any doubts, take it to a speedo service center.
I use the calculater on www.4lo.com. Me thinks you used the rim size, and not the tire diameter...Most 16 inch wheels will have a tire diameter of about 30 inches.
Unless you have overdrive... transmission ratio will be 1 in your top gear. if you don't have 4wd, transfer case ratio will be 1 I would recommend bringing a friend along to measure the time between mile markers (so you can keep your eyes on the road and your mind on driving  ) and go at least two miles or preferably five, while maintaining a constant speed. This should give you a good measure of the spedometers accuracy.
58 Fleetside, 235, "The Old Buckin' Bronco"
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