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1973-1987 Chevrolet & GMC Square Body / Rounded Line Pickups

General and technical discussion for 1973 through 1987 Chevrolet and GMC pickup trucks. These years were otherwise known as "square body" pickups, although GM officially called them "rounded line" designs. Parts wanted and for sale encouraged.

382 topics in this forum

  1. 8.1 Vortec 496 Gas Or 5.9 Cummins Diesel For A 1983 C20 4 Door Dually With A Turbo 400 3 Speed Auto And 454 Carburated Gear Ratio 4:10

    By Saint Fifty One,
    • 0 replies
    • 861 views

  2. Square Body Beast

    By dieselfan1,
    • 0 replies
    • 771 views

  3. Wiring diagrams

    By 81 K10,
    • 1 reply
    • 912 views

  4. 6.0 swap

    By Derrick Reed,
    • 5 replies
    • 1.3k views

  5. Truck stalls right after starting

    By Bernier,   
    • 0 replies
    • 546 views

  6. No Factory installed GPS

    By SKALC,
    • 0 replies
    • 708 views

  7. Need front driveshaft bolts

    By Mark Dumka,
    • 1 reply
    • 1.7k views

  8. Paint codes for one-off factory job

    By Chambo,
    • 0 replies
    • 640 views

  9. 83 1/2 ton rust problems/build

    By William Nelson,   
    • 2 replies
    • 2.3k views

  10. Compatible frames years for 1979 GMC High Sierra C2500

    By Cody26,
    • 1 reply
    • 872 views

  11. NO POWER

    By IMANITRONUT,
    • 4 replies
    • 594 views

  12. Clutch linkage

    By Jstevens7700,
    • 1 reply
    • 1.2k views

  13. Vapor lock?

    By JoeD. M.,
    • 2 replies
    • 2.3k views

  14. Power to fuel pump

    By Casey 8520,
    • 1 reply
    • 1.4k views

  15. 87 Chevy 5.7 will not run while in gear 1 2

    By 87chevys5.7,
    • 25 replies
    • 2.9k views

  16. 79 K10 EFI options

    By 2018GMC,
    • 2 replies
    • 920 views

  17. 1981 C10

    By Austin McQuillin,
    • 6 replies
    • 1.2k views

  18. NEW MEMBER

    By Squarebodymike,
    • 0 replies
    • 1.2k views

  19. 1978 Sierra Classic

    By jleair,
    • 1 reply
    • 732 views

  20. 76 C10 Stepside

    By Eddie 70,
    • 2 replies
    • 1.4k views

  21. No fuel 1 2

    By Gallia Khaskey,
    • 18 replies
    • 4.4k views

  22. Pump Accelerator Won't Start without priming with fuel

    By RDV,
    • 1 reply
    • 679 views

  23. 1978 GMC Royal Sierra

    By willevans2,   
    • 3 replies
    • 5k views

  24. 1973 C60 wheel cylinder parts

    By Diesel80,
    • 3 replies
    • 3.7k views

  25. 1979 k20 fleetside Cheyenne fuel sending unit

    By Jon Rush,   
    • 1 reply
    • 2.3k views
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