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  1. #1
    Join Date
    Mar 2010
    Posts
    469

    Low Tech '71 GMC long box autocross video

    A few months ago I decided to do autocross school with my '71 GMC long box. Just wanted to try it as a baseline experiment before I dive into chassis mods. At the moment it's very simple 4-6 drop, bell tech shocks, a front 1 1/4" sway bar. After that, it still running the stock disc/drum set-up and the stock manual 24:1 manual steering. My arms had one hell of a workout. Power is provided by a LS427/t56 combo.

    Autocross was crazy fun to stat the obvious. AND it handled way better than expected. The jokes from the STis, EVOs, Porsches, M3s etc was fun on the first day, but by day 2 they were getting quiet.



    At the moment, it's getting a full AGR Quick Ratio Race box set-up (thanks Matt) and a Willwood brake kit - just to make it a bit more capable as I take on a track known as Mosport this week-end.


    https://vimeo.com/69659162

    Enjoy the video. The run starts around 1:35ish.

    P.S. Race your trucks. It's a riot.


  2. #2
    Join Date
    Jan 2006
    Posts
    1,745
    Country Flag: United States
    Cool video
    GeoffP
    68 Camaro - LS1/T-56

  3. #3
    Join Date
    Aug 2011
    Location
    Clearwater/FL
    Posts
    512
    Country Flag: United States
    Nice. ..
    85 monte, drift project- small block t5 and 8.8
    88 Blazer sbc
    05 300c

  4. #4
    Join Date
    Nov 2011
    Location
    Livermore, CA
    Posts
    672
    Country Flag: United States
    So awesome, great attitude, and I love the determination on your face getting that through the course. But it did look like with the steering that you missed a gate in the slalom: ) Well done, really enjoyed it!

    -Tory

  5. #5
    Join Date
    Nov 2008
    Location
    Lawrenceburg, TN
    Posts
    3,947
    Country Flag: United States

  6. #6
    Join Date
    Apr 2009
    Location
    san diego
    Posts
    5,102
    Country Flag: United States

  7. #7
    Join Date
    Dec 2005
    Location
    Birmingham, AL
    Posts
    3,356
    Country Flag: United States
    Great looking truck. Thanks for keeping the gmc grill. It looks better than the chevy ones. What model wheel is that?
    Stephen

  8. #8
    Join Date
    Mar 2010
    Posts
    469
    Thanks for the kind words. I want to keep it fun. I hate golf, so I build and race cars.

    Tory - The camera shake blurs it a bit, the final part of the slalom was a double left - however, wiping out the stop box was a deal breaker. lol.

    Stephen - I like the toughness of the GMC too, but when I started building this thing (25 years ago), I contemplated changing it - Glad I did not.

    The steering wheel I believe is from the 67-68s, maybe 69. However, these wheels were also on 5 ton trucks - that's where mine came from. The wheel is the same, but if you buy a 1/2 ton truck one the dude selling it to you will charge more than if you get one off a 5 ton work truck - again - same wheel. You can buy them repro now.

  9. #9
    Join Date
    Nov 2012
    Location
    Arizona
    Posts
    41
    Country Flag: United States
    Nice! I like it!

  10. #10
    Join Date
    Oct 2012
    Location
    MAYODAN,NC
    Posts
    63
    Country Flag: United States
    thats cool and looks fun.

  11. #11
    Join Date
    Feb 2008
    Location
    Minneapolis, mn
    Posts
    214
    Country Flag: United States
    Giddy up! Love it!
    Sean

    50 Willys Pick up.

  12. #12
    Join Date
    Oct 2005
    Location
    Toronto
    Posts
    1,469
    Good times indeed....
    Carbon Kustoms Limited
    A.K.A. Albert from Toronto

  13. #13
    Join Date
    Nov 2008
    Location
    NC
    Posts
    574
    Country Flag: United States
    Awesome vid, sounds killer.
    Thanks for sharing

  14. #14
    Join Date
    Aug 2011
    Location
    Sevierville, TN
    Posts
    525
    Country Flag: United States
    Nice vid. Thanks for sharing.
    Matt Kenner

    68 C10 stepside

    If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. - Mark Donohue

  15. #15
    Join Date
    Jan 2008
    Location
    Springfield MO
    Posts
    42
    Country Flag: United States
    Super fun stuff, glad you posted.

  16. #16
    Join Date
    Mar 2010
    Posts
    469
    Again, thanks guys. I was out again this week-end. This time on an Bridgestone Tire training track. Super fun.The Willwood brake upgrade and AGR 14:1 Race box set-up made it super interesting. I need to dial a few details in for the next time, but it was great, great fun. Video to come when I have time to edit it together.

  17. #17
    Join Date
    Mar 2010
    Posts
    469
    Here's a photo my buddy took from yesterday (July 7th). Yeah, it rained like mad.

    Name:  trucky_mosport_ger.jpg
Views: 415
Size:  94.6 KB
    Last edited by bovey; 07-08-2013 at 09:35 PM. Reason: spelling, grammar - stuff like that.

  18. #18
    Join Date
    Jan 2008
    Location
    Springfield MO
    Posts
    42
    Country Flag: United States
    cool an army of trucks or something like that?
    so you say it made it super interesting... what do you mean by that? Was it better?

  19. #19
    Join Date
    Mar 2010
    Posts
    469
    Quote Originally Posted by custom 68 View Post
    so you say it made it super interesting... what do you mean by that? Was it better?
    Yes. Sorry. Interesting is a good word for me. Handling was greatly improved with the upgrades. However, with better steering and brakes - I may have found the limit of my spring/shock combo. Going to work on technique and try to keep the speed down - which is not easy.

    FYI - The Toyo 888 work crazy good - I had a C6 owner on a ride along and he was shocked by the grip - I'm running 255/30/18 front - 275/40/18 rear on 18x9 with 5" b/s wheels all the way around.

  20. #20
    Join Date
    Oct 2005
    Location
    Toronto
    Posts
    1,469
    Track day down at Cayuga yesterday??
    Carbon Kustoms Limited
    A.K.A. Albert from Toronto

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