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1985 GMC Crew Cab Build

Discussion in '2wd Pick-Ups C/R 20 2500 C/R 30 3500' started by RatSoup, Oct 31, 2020.

  1. RatSoup

    RatSoup Junior Member

    Posts:
    15
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    Joined:
    Feb 16, 2020
    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    I finally got around to working on the GMC. I had to gut the interior. Mice can do a lot of damage if left unchecked for 7+ years.

    The plan is to clean it up, fix anything thats broke, put a 5.3 LS in it and cut the frame for a short bed (I know! I know! But I like short beds). Then paint it a medium blue.

    Here's what it looked like when I got it.
    20200513_184819.jpg

    Here's what it looks like now.
    20201031_135033.jpg

    20201031_135048.jpg

    I'll try to post here as I go.
     
  2. Craig 85

    Craig 85 Full Access Member

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    Joined:
    Jan 25, 2017
    Location:
    Grass Valley, CA
    First Name:
    Craig
    Truck Year:
    1985
    Truck Model:
    K30 SRW
    Engine Size:
    454/TH-400/NP205
    Weld super singles where my dream wheel in the 90's. I couldn't see spending $200 a wheel back then when I could get American Racing for about $75 ea. Nice project. Back in the 90's my brother in law tried to get me to shorten my truck.

    1980 C20 (2).jpg
     
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  3. RatSoup

    RatSoup Junior Member

    Posts:
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    34
    Joined:
    Feb 16, 2020
    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    Firewall insulation is a pain to replace. Everything has to come out. Some of the holes didn't line up. Had to cut several of them.
    20201031_135152.jpg

    Got the A/C and vent ducts cleaned up and put back in. Went ahead and installed a new heater core while I had it out.

    Installed some kilmat. I ran out and had to order some more.
    20201108_124559.jpg

    20201108_124616.jpg
     
  4. OldBlueDually

    OldBlueDually Full Access Member

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    2,844
    Joined:
    Jun 8, 2020
    Location:
    Minnesota
    First Name:
    Justin
    Truck Year:
    1976 GMC
    Truck Model:
    C30
    Engine Size:
    455 Olds
    Cool build!!! Not sure how I feel about that there new fangled short bed idea though :anitoof: ....but, it isn't mine so if you like it that is ALL that ever matters!!! Sell the long box though, fund some more cool stuff!

    So will you be putting the Weld brand super singles on this baby?

    Love those crew cabs!
     
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  5. RatSoup

    RatSoup Junior Member

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    Joined:
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    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454

    Thanks! I'm pretty excited about it. It's been sitting in the yard for a while. I'm finally getting to work on it.
    I am planning on selling the bed to offset some of the cost of the project.
    I'm not using the wheels that came on because they are 16.5". It's too hard to get tires for them. I already bought some 16" aluminum wheels for it.

    20201031_135243.jpg
     
  6. RatSoup

    RatSoup Junior Member

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    Joined:
    Feb 16, 2020
    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    I got quite a bit done today. Finished up the kilmat. Installed the new dash, steering wheel and gauge cluster. Layed the carpet in so it could relax for a while.

    20201114_170212.jpg

    20201114_170243.jpg
     
  7. Old77

    Old77 Super Moderator Staff Member

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    Joined:
    Aug 19, 2010
    Location:
    Kansas City, Mo
    First Name:
    Jacob
    Truck Year:
    1977/1991
    Truck Model:
    C10 longbed/R3500 Dually
    Engine Size:
    350/454
    Looking good!!
     
  8. GXPWeasel

    GXPWeasel Full Access Member

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    Joined:
    Nov 5, 2019
    Location:
    Kansas
    First Name:
    Greg
    Truck Year:
    1982 | 2015
    Truck Model:
    Sierra C15 | Silverado Z71
    Engine Size:
    5.0 | 5.3
    Nice!
    I like the steering wheel too.
     
  9. RoryH19

    RoryH19 Full Access Member

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    Joined:
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    Location:
    Texas
    First Name:
    Rory
    Truck Year:
    1987
    Truck Model:
    R10 Silverado SWB
    Engine Size:
    350 TBI
    I installed a new firewall pad and killmat in my k5 recently too. Firewall pad was a bit of a pain but the killmat took longer. Went through 2 boxes of 36sqft. That was just the floor. Good price off Amazon and delivered in 2 days.

    Good idea on the heater core. I replaced mine too. Cheap part and you already did the hard work to remove for the firewall pad.
     
  10. RatSoup

    RatSoup Junior Member

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    Joined:
    Feb 16, 2020
    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    I got the engine pulled this weekend. Had some trouble with my old home made cherry picker. It leaks oil like crazy. And it stopped lifting here.

    20201117_185248.jpg

    I had to pull the core support to get the engine out. Grrrr!

    20201122_162458.jpg

    Here's it's replacement. Sitting next to my new cherry picker.

    20201122_162547.jpg
     
  11. RatSoup

    RatSoup Junior Member

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    Joined:
    Feb 16, 2020
    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    It's been a while, but I made some progress. Got the motor installed and mostly wired up. If I had to do it again, I'd buy a wiring harness. I spent way too much time modifying the factory harness.

    Just need one more fitting to finish the fuel system (they sent one wrong fitting). Then I can fire it up!

    20201227_143313.jpg

    20201227_143258.jpg

    20201227_143330.jpg
     
  12. RatSoup

    RatSoup Junior Member

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    Joined:
    Feb 16, 2020
    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    Got her started today!! Purrs like a kitten.

    Now i just have to install the new throttle pedal... and finish up the other 9000 little things.

    Seats should be back from upholstery in a week or so.
     
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  13. RatSoup

    RatSoup Junior Member

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    Joined:
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    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    Still waiting on my seats. I had to pick a different material. Evidently Covid has shut down the factories that make the materials. I had to pick something close to the same colors that was in stock.

    May be next week. Fingers crossed.
     
  14. Dmack

    Dmack Full Access Member

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    Joined:
    Mar 13, 2019
    Location:
    Central OR
    First Name:
    Dave
    Truck Year:
    1983
    Truck Model:
    K20
    Engine Size:
    350
    Nice work. Curious on the ls wiring. Have you done it before, using a guide, or ??
     
  15. RatSoup

    RatSoup Junior Member

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    Joined:
    Feb 16, 2020
    Location:
    Arkansas
    First Name:
    Lee
    Truck Year:
    1985
    Truck Model:
    C20 Crew Cab
    Engine Size:
    454
    Thanks.

    This is my first time doing an ls swap. I got most of my info from lt1swap.com and youtube. It's not hard if you take your time and pay attention.

    I should add that I work with control wiring at my job so I'm kinda used to it.
     

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