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yellow AC DELCO platic box and wires frominstrument panel at the speedo ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by R72K5, Aug 24, 2003.

  1. R72K5

    R72K5 Banned

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    is an 83-86 truck 350 4bbl carb truck and theres a yellow plastic AC DELCO box and wires coming out of the back of the instrument panel and next to the speedometer, what is that for ?
    ive seen one similar on back of the tachometers in the third gen camaros and firebirds but never on a truck til today when i took the '83-'86 GMC C-2500 pickup apart and cut up the cab and front clip for scrap

    i saved it and wiring plugs til i findout what it is

    thanks
     
  2. Rolled

    Rolled 1/2 ton status

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    Sounds like the VSS. If it was >= 1987, I would say it is a VSS. Not sure when they started using those though.
     
  3. K5 NUTT

    K5 NUTT 1/2 ton status

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    Usually they are green but basically its a vss buffer box....cable spins a wheel and an electric eye of sorts genertates a signal which is buffered by the box and sent to the cruise module...

    DW
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    [ QUOTE ]
    Not sure when they started using those though.

    [/ QUOTE ]

    VSS started in some GM cars in 1980 I think, trucks when they got the 700R4. ('82 I believe)
     
  5. R72K5

    R72K5 Banned

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    interesting, what about on this th400 truck then ?it has electric kickdown switch for 400 trannyon the accelerator pedal bracket, so...


    odd.,
     
  6. R72K5

    R72K5 Banned

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    green and red wires, three i think, runs right next ot where cable clipsonto back of speedo,
     
  7. Rolled

    Rolled 1/2 ton status

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    Thats the VSS alright. Has nothing to do with the tranny. FI and cruise control *should* be all it is used for.
     
  8. R72K5

    R72K5 Banned

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    cool, learn soemthing new every day or twoanymore these days, any reason to keep thisone, do they commonly go bad,or arethey ever seekedout by anyone for conversions or anything ?

    thanks
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    [ QUOTE ]
    Thats the VSS alright. Has nothing to do with the tranny. FI and cruise control *should* be all it is used for.

    [/ QUOTE ]

    On a TH400/manual truck, this is correct.

    It is not correct for a TH350C or 700R4, as the torque converter minimum MPH "lock" (lowest MPH that it will lock up at) uses VSS. This is why converter lockup is so consistent in 700R4 trucks at steady cruise in gears that TCC operates.
     
  10. R72K5

    R72K5 Banned

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    sometimes learn even more the same day, hehe

    should i keep the box, or is it waste of space ?

    thanks!
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    Someone may be able to use it, but they came in virtually every GM car and truck up until the early 90's, so they aren't rare by any stretch of the imagination. There are 3 or 4 variations. (different plugs and circuit board setup)

    I don't know as I'd save it unless you think you will have a need for it in the future, and no one needs it right now. You know how it goes with spare parts. As soon as you toss something, you or someone you know needs it.
     
  12. R72K5

    R72K5 Banned

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    Re: yellow AC DELCO platic box and wires frominstrument panel at the speedo

    [ QUOTE ]
    Someone may be able to use it, but they came in virtually every GM car and truck up until the early 90's, so they aren't rare by any stretch of the imagination. There are 3 or 4 variations. (different plugs and circuit board setup)

    I don't know as I'd save it unless you think you will have a need for it in the future, and no one needs it right now. You know how it goes with spare parts. As soon as you toss something, you or someone you know needs it.

    [/ QUOTE ]

    hmm yeah, hmm,.. dunno, it will get lost in the building soemwhere anyways, probably already is, even after removign it only the other day

    thanks@!
     

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