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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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