First you have to find out what driven gear you have. And who made the transmission where that gear rides. Then you have to do the math to find out how many more teeth you need. Then you can start with the parts room at the nearest dealer for the make of transmission. Sometimes its hard to get enough teeth on the driven gear and you have to change the driver and the driven. I know Ford parts counters have a book of speedometer gears.
I changed my F-150 from 3.08 to 4.10 gears. It had an 18 tooth driven gear, and I computed I needed a 24 tooth driven gear for the same driver. I had to go to a couple dealers who customized Mustangs to find a 23 tooth driven gear (6 months later truck and it would have been a computer setting). Since the teeth on that gear are very thin, I bought a spare. So far in 80,000 miles I've not needed the spare.
It should be that hot rod shops that sell rear axle gears carried the speedometer gears, but I've not found that to be the case.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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