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Labor Day Putting down your wrenches or time for
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2018 Posts: 1,004 'Bolter | | 'Bolter Joined: Aug 2018 Posts: 1,004 | okay i'm curious
which gear is "plastic worm gear"?
i've only taken apart about 4 speedometers to date ranging from 1950-53 years, both 0-80 and 0-90 type and that recent special 0-140 KPH metric speedo.
All the gears and worms are metal up to the first odometer counter.
Input shaft worm (steel) -> first gear to worm shaft (steel) -> second gear to worm shaft (steel) -> idler gear (metal, maybe brass) -> 1/10 ths wheel on odometer (odo is plastic).
maybe a photo would help
thanks
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