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57-82 Speedometer Driven Gear - 21 Tooth - Red
Item #:
In Stock - Ships Monday
New reproduction 1957-1982 Corvette 21 tooth speedometer driven red gear. Speedometer driven gears mount inside manual or automatic transmission where the speedometer cable attaches. Gears vary upon transmission, differential ratio and tire size. Correct usage can be identified by # of teeth and color of gear. Gears are often found broken and unable to properly drive the speedometer cable OR need to be replaced to provide more accurate speedometer readings due to changes in tire size or differential ratio.

Note: Changes in gear can affect how the speedometer reads. If you speedometer is reading fast, install a gear with more teeth to reduce speed. If your speedometer is reading slow, install a gear with less teeth to correct speedometer. One (1) tooth = approximately 1.5 mph. Gear sleeve may need to be changed when changing the gear usage.

This item is proudly Made in the USA

Model Years

More Information
Generation C1, C2, C3
Model Year 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982
Additional Item Information
  • OE GM PART #: 3987921
    *GM part # provided for lookup purposes only.
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