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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. 1984 GMC C2500 Truck Proportioning Valve

    By Totty101,
    • 3 replies
    • 2.6k views

  2. Replaced Brake Booster Now Pedal Goes To The Floor

    By Totty101,
    • 8 replies
    • 6.5k views

  3. RPO Codes - 1979 GMC

    By cam1fast69,
    • 5 replies
    • 11.5k views

  4. fuel tank shields

    By Steve Racette,
    • 1 reply
    • 1.2k views

  5. Oshawa Truck Assembly Pics From the 70s

    By revrnd,
    • 2 replies
    • 1.7k views

  6. Last year of NO computer GM trucks??

    By Willyone,
    • 12 replies
    • 58.6k views

  7. A few cold start videos

    By Logan Lanfear,
    • 2 replies
    • 1k views

  8. rear leaf spring hanger measurments

    By 2014AT,
    • 1 reply
    • 1k views

  9. first new truck

    By cubfarm,   
    • 0 replies
    • 996 views

  10. Carburetor Linkage Clips

    By FishGeek,
    • 0 replies
    • 732 views

  11. 1986 GM 1500

    By Mpalmer,
    • 1 reply
    • 1.2k views

  12. Help with Duel fuel tanks

    By RBell23,
    • 2 replies
    • 1.6k views

  13. Help with 82 GMC RPO codes

    By 92rado,
    • 5 replies
    • 11.7k views

  14. 81 cruise control

    By stephenchilders72,
    • 0 replies
    • 1.1k views

  15. Hard finding parts.

    By Semikrazy,
    • 6 replies
    • 2.4k views

  16. Best Radiator for a 1978 pickup??

    By kingbaja,
    • 2 replies
    • 1.5k views

  17. New to the forum & working on my first restoration

    By kingbaja,
    • 3 replies
    • 1.8k views

  18. A/C system

    By kingbaja,
    • 0 replies
    • 953 views

  19. Interchanging Seats

    By jbrise,
    • 1 reply
    • 3k views

  20. 78 sierra grand...whats in it??

    By richardGMCwilson,
    • 1 reply
    • 1.2k views

  21. Just wanted to say hi.i am new to forum.just restoring my 1983 k10.

    By whiskey101,
    • 5 replies
    • 1.2k views

  22. 1978 z71 camper special

    By Chevylover16,
    • 4 replies
    • 1.6k views

  23. New guy with big news

    By C10Outlaw,
    • 4 replies
    • 1.2k views

  24. 1987 chevrolet R10 half ton ignition problem

    By bph320,   
    • 5 replies
    • 5k views

  25. 1976-78 GMC Royal Sierra

    By ericzand,
    • 4 replies
    • 1.9k views
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