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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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