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HD trans

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Cavalry, Dec 17, 2000.

  1. Cavalry

    Cavalry 1/2 ton status

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    My 84's RPO sheet has a 1VO2 heavy duty transmission. Whats so special about it?
     
  2. FWP

    FWP CRS

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    There's a site that lists those codes, but I can't remember what it's called.... I thought I saw a post awhile back about this, search and see. Maybe bring it back to the top or post if you find it. I'd like to bookmark it. Thanks.

    [​IMG]
     
  3. HarryH3

    HarryH3 1 ton status Author

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    I think that there just wasn't enough room for the entire description. That sounds like the RPO number for the Heavy Duty Transmission Cooler. It nets you a larger tranny cooler inside the radiator.

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  4. Cavalry

    Cavalry 1/2 ton status

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    I'm not saying anyone is wrong but why would GM have a extra big rad cooler RPO when there is a external tranny cooler RPO. When I replaced my radiator, it was exactly identical to the replacement 3 core. There was nothing special about the new one. Just my opinion of course
     
  5. HarryH3

    HarryH3 1 ton status Author

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    I've never seen a factory external tranny cooler on a GM. Are you sure you aren't looking at the external engine oil cooler? That was optional on K5's some years.

    My '91 S-10 has both an extra large in-radiator tranny cooler (that's why the RPO number looked familiar to me) and an in-radiator engine oil cooler.

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  6. undertow

    undertow Registered Member

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    i have a factory external tranny cooler on my late model tahoe... whether that applies to 69-91, i dunno.

    .undertow.
     
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    VO2 is the code for a Heavy Duty rad WITH a built in tranny cooler. Here's the rest of the cooling system codes:

    VO1/VO5- Heavy Duty radiator

    VO3- Extra capacity Cooling System

    VO8- Heavy Duty Cooling System

    And for anyone who cares:

    V12- Power Steering Fluid Cooling System(Factory)

    V14- Auxilliary Transmission Oil Cooler(Factory)
     
  8. Cavalry

    Cavalry 1/2 ton status

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    Thanks Canmore....glad we got all that cleared up
     

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