COPO 4.56 High Impact Gearset NOS? 3917973.

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**Fast67VelleN2O** · #1 06-24-2012, 08:19 PM

COPO high impact 4.56 gearset for 12 bolt. Tooth count 9-41. These look to be NOS but can't be 100% sure. GM box has part number 3917973 listed and box is dated 8/4/72. Pinion has part number 3916231 and is dated 1-73. Ring gear has part number of 3916230 and is dated 1-72. Box is almost destroyed since it got damp at some point. Gears have a few extremely small spots of pitting here and there since they were damp as well but will not cause any issues once installed. $350 shipped to your door or best offer for the set. Please message me with any questions.

-Matt

**Fast67VelleN2O** · #2 06-26-2012, 03:10 PM

$350 for the set if you're interested.

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