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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
      1,748
      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
      668
      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
      4,083
      Country Flag: United States
      awesome!



    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
      64
      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
      1,465
      Good times indeed....
      Carbon Kustoms Limited
      A.K.A. Albert from Toronto

    13. #13
      Join Date
      Nov 2008
      Location
      NC
      Posts
      583
      Country Flag: United States
      Awesome vid, sounds killer.
      Thanks for sharing

    14. #14
      Join Date
      Aug 2011
      Location
      Sevierville, TN
      Posts
      524
      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: 1002
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
      1,465
      Track day down at Cayuga yesterday??
      Carbon Kustoms Limited
      A.K.A. Albert from Toronto

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