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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.

358 topics in this forum

  1. 1978 Silverado, K30 Dually, 4x4, Crew Cab (3+3), Long bed.

    By GHV,
    • 2 replies
    • 226 views

  3. Np205 stick in 2wd position But driving in low range

    By Andrew Kapel,
    • 1 reply
    • 142 views

  4. Rebuild 700r4, anyone done it?

    By W8MCC,   
    • 4 replies
    • 385 views

  5. 1987 R30

    By Jon12345,
    • 1 reply
    • 329 views

  6. 1984/85 k2500

    By mikewasilla,   
    • 1 reply
    • 419 views

  7. New Neighbor's Square Body

    By AlaskaErik,
    • 1 reply
    • 363 views

  8. C20 Driveline Carrier Bearing lubrication?

    By markdafedman,
    • 2 replies
    • 388 views

  9. Just purchased a 1975 C5 with a 366 - where to buy parts??

    By Todd Butler,
    • 1 reply
    • 439 views

  10. turbo400 trans

    By andrew futter,
    • 0 replies
    • 348 views

  11. Does Anybody Have A Royal Sierra? 1 2 3

    By royalsierraguy,
    • 33 replies
    • 24k views

  12. Np203 jerking question

    By Thomas Mann,
    • 0 replies
    • 387 views

  13. Hard staring 305 with Rochester carb.

    By Rocky Roads,
    • 1 reply
    • 684 views

  14. Old Blue for sale

    By Stanley Preskitt,
    • 0 replies
    • 1k views

  15. 75 C30 Rear Drum Brake Locked Up

    By David Nicholas,
    • 0 replies
    • 668 views

  16. 1976 GMC Eleganza Stalling Issue

    By Janet Rocco,
    • 0 replies
    • 666 views

  17. 83 1500 8ft bed cab and bed swap onto a 2013 1500 4wd 8foot bed chassis

    By Robnj51,
    • 0 replies
    • 633 views

  18. 1985 Short bed step side 4wd production numbers

    By Red 85 GMC stepside,
    • 0 replies
    • 753 views

  19. Loud Engine Knock While Accelerating

    By ArcticCatIV,   
    • 0 replies
    • 1.3k views

  20. 79 short box stepside project

    By ottoman,
    • 0 replies
    • 795 views

  21. 1973 power window switches

    By Dawson Garland,
    • 1 reply
    • 820 views

  22. 87 chevy tbi 350 no fuel

    By Markus Escamilla,
    • 0 replies
    • 1.1k views

  23. New here, but not a square body owner yet

    By blazblu82,
    • 0 replies
    • 675 views

  24. Help Identifying wheels.

    By ToddSw,
    • 7 replies
    • 1.3k views

  25. Troubleshooting

    By Cladiesel,
    • 0 replies
    • 1.1k views

  26. 1986 chevy c10

    By Seth Putnam,
    • 2 replies
    • 1.2k views


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