78 K15 Build

Discussion in 'Member Photos' started by Matt Braun, Nov 3, 2017.

  1. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    First Name:
    Matt
    Truck Year:
    1978
    Truck Model:
    K15
    Engine Size:
    350
    This is a truck my 16 year old son bought a little over a year ago. He bought it as a snowplowing rig. He picked it up with the plow cheap and felt like he made out good. After using it last winter to plow snow for our residence and a couple clients, my son made enough money to pay for the truck in a season. Fast forward to the summer of 17, when we decided to button some things up and make it a bit more bullet proof for our use. The tranny was starting to slip and the fluid was burnt so we pulled the tranny this summer and had it rebuilt locally but a guy who makes them purpose built for snowplowing. I can't recall what he all did but I know some pump and hard part modifications were done with the standard overhaul. Here's a few pics and some commentary. This will be an ongoing build that will probably stretch into 2018.

    What we bought (plow not in picture)

    A large load of junk to the dump. The box was completely rotten, and one of the dual tanks had a hole in it. We decided to do a TBI conversion in the process, as we struggled last winter with cold starting the old Quadrajet, despite a carb rebuild.

    We stripped the frame down to nothing in put a coat of POR-15 on. So far I like it but we shall see how it holds up to the elements and road salt up here.

    The single exhaust someone put on it was ripped off for a set of dual Hookers. You can see my son mocking up and welding the exhaust.

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  2. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    Engine Size:
    350
    POR-15 on, new exhaust fully installed. Since we were doing a TBI conversion, we updated the tank/pump/sending unit to an 87.

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  3. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    Engine Size:
    350
    Removed rear drums in favor of a disc conversion from TSM. Fit and install were very nice.

    Replaced the rear axle bearings and seals at the same time. One axle bearing came out easy, the other had the outer race dispatched with a die grinder.

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    Last edited: Nov 3, 2017
  4. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    Engine Size:
    350
    And lastly, the rats nest formerly known as stock 1991 TBI harness. Got the beast running last night so need to do some final checks and then clean up the engine compartment and harness.

    IMG_6429.JPG
     
  5. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    Engine Size:
    350
    We found a Knapheide flatbed for cheap this fall, which will replace the old box. This will be it for the time being, need to have it ready to earn some money.
     
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  6. theBIGnaud

    theBIGnaud Full Access Member

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    First Name:
    Ryan
    Truck Year:
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    Truck Model:
    K-10
    Engine Size:
    Vortec 350
    Nice project! Try Evaporust...
     
  7. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    Truck Year:
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    Truck Model:
    V1500 Jimmy
    Engine Size:
    350
    Very nice work! Any SES lights or anything fishy with the TBI?
     
  8. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    As a matter of fact I am working through one right now. When key on, the SES flashes continuously. Truck starts and idles fine, but it cannot be driven (no power). I'm pretty sure its in limp mode. The SES light stops flashing after the truck starts. I'm trying to find another ECM to see if it is a chip or ECM issue. The PROM was just burned by Dave from Old School EFI, so I'm pretty sure that's not the issue.
     
  9. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    The next phase of this build is replacing the cab. We found this donor cab from a 74 2wd. The current cab is so far gone we're not even going to mess with it. The floor pans had "covers" put over them at one point and so consequently the floors, rockers, cab corners, all floor supports and kick panels are all gone. On this donor cab we are going to replace a lot of it also, but it will be much easier for us to swap this over and still use the truck for snowplowing while we work on the new cab. It looks Classic Parts has every replacement panel we need for the job.

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  10. B.K. Cunningham

    B.K. Cunningham Full Access Member

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    Truck Year:
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    Truck Model:
    Super Custom 2500
    Engine Size:
    350
    just beware that the hump for the trans is smaller on auto 2wd pickup cabs.
     
  11. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    Thanks for noting. I didn't realize that, just thought I'd have to cut out a hole for the shifter. Is the hump too small for a 4x4?
     
  12. B.K. Cunningham

    B.K. Cunningham Full Access Member

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    if the cab is a manual, the hump should be the same size as a 4x4 but if its an auto its smaller. I ill try and find the thread that was discussing this.
     
  13. B.K. Cunningham

    B.K. Cunningham Full Access Member

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    low vs high trans hump.

    lowtranshump.jpg

    transhump.jpg
     
  14. Matt Braun

    Matt Braun Supporting Member Supporting Member

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    Interesting. And here I thought all SB cabs were the same.
     
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  15. B.K. Cunningham

    B.K. Cunningham Full Access Member

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    350
    Yep, as similar as these things are from 73-87 there are so many more differences.
     

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