84’ GMC Jimmy “The Behemoth” restoration

  • 7A34C511-EB16-42D3-988F-B6D39A3A42D8.jpeg I purchased my first K5/Jimmy September 2019

    I have been wanting one of these for a very—very long time. When I picked it up it was a running driving unit. It needs some work but nothing out of the realm of my capabilities. Almost all the rubber needs replacing and now so does the engine.


    The first major obstacle was the drive shaft. The drive shaft that came with this truck was torched. The CV had broken and sheared the ball cup off the yoke completely:
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    So I had a brand new custom drive shaft made for me featuring all 1350 U-joints by Drivelines North West here in Washington. Great customer service and fantastic guys. Definitely go to them for your driveline needs:
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    Life was really good after that:
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    Then after taking it on its first ‘maiden voyage’ round trip of just over 80 miles, the thermostat stuck on me during the drive along with a faulty temp gauge and caused me to blow a head gasket:
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    So, like any man with tools, I began tearing the heads off the engine. A coolant pressure test showed a stuck thermostat and compression tests showed cylinder 8 was full of coolant:
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    After inspecting the cylinder walls I am still not 100% they are not cracked in #8. It appears a ring seized/broke or possibly someone had broken a spark plug end into the cylinder at some point:
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    I have the engine dropped off at the local engine machine shop to be inspected and if good will be punching the block over another 030 making this 383 effectively a 388:

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    In the meantime I am able to button up some of the smaller things.

    LMC Door Panels and Manual windows installed:
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    Fixed the wing window handles that were flopping around:
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    Painted the radiator support:
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    Made a custom headliner since the original was falling down:
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    And as of creating this build thread 10/7/19. That’s where we sit today. Hopefully by the end of October I’ll have a new/freshened up motor and be back on the road before the holidays.
  • Year:
    1984
    Make:
    GMC
    Model:
    Sierra Classic
    Engine:
    383 SBC
    Transmission:
    700r4
    Transfer Case:
    NP208
    Steering:
    ORD Stiffener Kit
    Suspension:
    4” Suspension Lift
    Axles:
    Rear: 14 B
    Front: 10 B 8 lug conversion
    Tires:
    35”
    Paint:
    Gun Metal