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Thread: Need help identifying brake drum #3684775

  1. #1
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    Need help identifying brake drum #3684775

    Was wondering if anyone can help me out to identify the correct application(s) for an original GM brake drum that I have. The part number 3684775 is on the drum. I have plugged this number into a search on gmpartswiki -- no results, no results on ebay. I'm not terribly savvy when it comes to part number searches on the internet, so any dependable info would be appreciated!

  2. #2
    Registered Member 56-210Sedan's Avatar
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    This is a tough one for sure i tried several searches and came up empty handed.
    55 Belair 2dr Sedan 350/350 loving every minute of it.
    56-210 2dr Sedan c4 front/rear suspension, and not sure when the ride will roll.
    Marty

    http://www.picturetrail.com/56-210sedan

    http://saccc567.com/

  3. #3
    Registered Member Run-em's Avatar
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    Might call a friendly salvage place or Chevy dealer to look that up for ya?

  4. #4
    Registered Member 56-210Sedan's Avatar
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    I am thinking that the number is more of a casting number rather then a part number, i get from some searches that say that if came off a 60's pickup (60-65) but nothing to confirm it though.
    55 Belair 2dr Sedan 350/350 loving every minute of it.
    56-210 2dr Sedan c4 front/rear suspension, and not sure when the ride will roll.
    Marty

    http://www.picturetrail.com/56-210sedan

    http://saccc567.com/

  5. #5
    Registered Member chevynut's Avatar
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    Maybe you could explain to us what exactly you're trying to do? If you're looking for some brake drums, I have a bunch of them in my scrap steel pile that are probably going to the scrap yard. If you're just trying to identify a drum to sell it, I can't help you there.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  6. #6
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    Thanks for the replies so far. To answer chevynut's question, I have a pair of 11" brake drum, hub, & backing plate assemblies that I want to sell. One of them has "GM 36?4775" on the outer rim. The 3rd digit is really hard to read, and I sure thought it was an 8, but it may be a 9. Any information about #3694775 would be appreciated!

  7. #7
    Registered Member chevynut's Avatar
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    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

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