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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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