Went for my first ride in my 64 yesterday after six years of looking at parts. So far so good, but as I was expecting, my speedometer is "off". According to my GPS, at 55 mph, my speedometer is reading 48 mph, at 30 mph, it's reading 25 mph. I don't know my rear end ratio. I have a SM420 4 speed tranny. Without getting too scientific, could I just purchase the next size speedometer gear, and get "lucky"? I find four different gears available, with 18, 20, 22, & 24 teeth. If my speedometer is slow, would I get a driven gear with "less" teeth? My gear has 19 teeth, so is "less" is the way to go, it looks like I only have one option, with the 18 tooth gear. My original gear is metal, and I can't see how it's attached in it's housing. Is there a clip deep down in the bore, on the cable end? Thanks for any help! Tom
Speedometer gear removal Attached is the photo of my speedometer gear in the housing. How do I remove the gear from the housing so I can replace the gear? If there's a clip inside the bore, I can't see it, and it would be too small to get any tool in there. Thanks for any clues.
Hey Tom. I have a number of those and I don't think the gear removes from the shaft portion of the assembly. It appears they are fabricated/constructed, the way you see it in the photo.
One of the parts places has four option of different teeth gears, in which they say fits the four speed trannys, as well as the 3 spd, etc. They're showing plastic gears with a shaft, for about $7 No housing shown or mentioned. Is their data in error? At any rate, I'd have to find a gear to fit with 18 teeth.
