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63-72 10.4 Clutch Flywheel Ring Gear
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Related To This Item
Replacement flywheel ring gear - fits 1963-1972 327/350 Corvettes with the 10.4" clutch. Flywheel diameter - 12" inside diameter of the ring gear. Original GM # 3991407.
This item is proudly Made in the USA

Model Years

More Information
Generation C2, C3
Model Year 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972
Additional Item Information
  • OE GM PART #: 3991407
    *GM part # provided for lookup purposes only.
  • WARNING: This product can expose you to a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to
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