RPO code MY6 in a 1990?

Discussion in 'Other Vehicles' started by curbstone mech, Oct 10, 2018.

  1. curbstone mech

    curbstone mech Supporting Member Supporting Member

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    Why would a 1990 Silverado 4x4 have an RPO code of an MY6 transmission? I'm hoping that it is an A833 trans but could it be an NV3500? I thought that the A833's weren't available after 1987.This truck has the 4.3 engine in front of the trans! I want to grab the trans for my square body 79, but something seems strange.The rpo codes are still there in the truck and even the owner's manual stating that its a 1990. I'll have to lift the truck up out of the weeds before I can do a visual.
     
  2. RetroC10Sport

    RetroC10Sport Super Moderator Staff Member

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    It's an SM465.
     
  3. Keith Seymore

    Keith Seymore Full Access Member

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  4. RetroC10Sport

    RetroC10Sport Super Moderator Staff Member

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  5. curbstone mech

    curbstone mech Supporting Member Supporting Member

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    Thanks for the replies. I guess I'll start looking for an NV4500 again
     
  6. Keith Seymore

    Keith Seymore Full Access Member

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    Let me say this differently: the New Process A833 was gone by 1990.

    Technically MY6 and MM4 are "merchandised" option codes, related to the "non - merchandised" codes of MY0 and M20, but I can see where it could be said they drive the "provisions" for their respective content.

    K
     
    curbstone mech likes this.

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