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2004 Annual Summit Truckstyle 4Wheel Jamboree - Ohio Octane

Posted in Events on May 1, 2005
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For those of you who aren't aware, 4-Wheel Jamborees have been a staple in the four-wheeling world since our sister publication, 4-Wheel & Off-Road, pioneered the concept of the Jamboree back in the early '80s. Jamborees, or Jambos as they are often called, are usually two or three days in length and feature a whole bunch of events centered on four-wheel-drive vehicles. All Jamborees are held at county fairgrounds and it's a given that each event will feature a truck show; Tough Truck, monster truck, and mud racing; and an area dedicated to four-wheel-drive parts and accessories. Some Jamborees have their own special features though. One such event was the 7th Annual Summit Truckstyle 4-Wheel Jamboree, which was held last July in Canfield, Ohio. This event featured all of the aforementioned activities as well as competition rockcrawling and diesel truck pulling.

We hung out for a couple of days and watched the festivities unfold. We also photographed a few feature trucks that we'll publish in future issues. The bad news is that the Canfield event has been eliminated from the '05 Jamboree schedule. The good news is that Jamboree promoter Special Events has six events on tap for '05 (see sidebar), and each will feature a full array of activities. Some will even feature rockcrawling and some may include DHRA diesel truck pulling. For more information on any of the 4-Wheel Jamborees, contact Special Events at 317/236-6525 or log on to

PhotosView Slideshow

April 2-3 Inaugural O'Reilly Auto Parts Texas 4-Wheel Jamboree Nationals, Fredericksburg, Texas
April 30-May 1 8th Annual O'Reilly Auto Parts 4-Wheel Jamboree Nationals, Springfield, Missouri
May 13-15 20th Anniversary Spring 4-Wheel Jamboree Nationals, Lima, Ohio
July 8-10 18th Annual Summer 4-Wheel Jamboree Nationals, Bloomsburg, Pennsylvania
August 6-7 11th Annual Bond Auto Parts 4-Wheel Jamboree Nationals, Essex Junction, Vermont
September 23-25 24th Annual Fall 4-Wheel & Off-Road Jamboree Nationals, Indianapolis, Indiana

When Special Events introduced Tough Truck racing in the early '90s, most competitors hit the track in their daily drivers. Through the years, Tough Trucks have evolved into specialized machinery. Today, these trucks are designed to handle a variety of tasks. They must accelerate fast, exhibit stability when cornering at high speed, and repetitively jump and land without grenading parts. So what makes 'em tick? Following is some of the tech behind two Modified Class Tough Trucks.

Owner: Joseph Leone, Largo, Florida
Vehicle/Model: '78 Chevy C10, custom rollcage welded to frame, diamond-plate and aluminum interior

Type: 362ci Chevy V-8
Modifications: Engine set back 12 inches in frame and beefed with an Eagle crankshaft and piston rods, SRP pistons, custom ground roller cam, Jegs 220cc Runner heads, Edelbrock Super Victor intake, and Holley 750-cfm HP Series carburetor
Horsepower (estimated): 600

Transmission: Turbo 350 with modified TCI manual valvebody and 3,800-rpm stall converter
Transfer case: NP203 with custom lengthened front yoke so the CV-jointed front driveshaft could be replaced with a standard 1-ton driveshaft; heavy-duty transfer-case frame crossmembers
Front: Custom three-link with track bar, aluminum swing arm with chromoly spherical rod ends, King coilover shocks with "custom and secret valving"
Rear: Custom triangulated three-link, aluminum swing arm with chromoly spherical rod ends, King coilover shocks with "custom and secret valving"
Total wheel travel (f/r, in.): 24/30 (limited during competition)

Front: 8 1/2-inch ring gear GM, Auburn limited-slip, custom steering with relocated 1-ton steering box
Rear: GM 12-bolt, Moser 30-spline axles, Detroit mini-spool
Ring and pinion: 3.42:1

Wheels: 15x10 TrailReady bead locks
Tires: 33x15.50-15 Mickey Thompson Baja Claw

Owner: Rory Campbell, Portland, Indiana
Vehicle/Model: '03 Ford Ranger Boatec fiberglass body, modified early Bronco frame, 46-point rollcage

Type: 366ci Ford V-8
Modifications: Engine and transmission lowered 5 inches, Trick Flow Specialties heads, Aries pistons, Scat crankshaft, Summit H-beam piston rods, Edelbrock Pro Flo fuel injection, custom headers, Flowmaster mufflers, MSD ignition, Painless Performance wiring harness, Flex-a-lite radiator and dual electric fans
Horsepower (estimated): 650

Transmission: Russ Moore-built C4 automatic with Art Carr valvebody and shifter
Transfer case: Dana 20 with custom 32-spline output shafts

Front: Custom three-link, Sway-A-Way coilover shocks
Rear: Custom four-link, Sway-A-Way coilovers shocks
Total wheel travel (f/r, in.): 14/18 (limited during competition)

Front: Moser-built 9-inch Ford, 31-spline Moser axleshafts, Auburn limited-slip, Wilwood Engineering four-piston calipers, custom rotors, Appleton 2.5:1 rack-and-pinion steering with custom mount
Rear: Moser-built 9-inch Ford, 35-spline axleshafts, Detroit Locker, Wilwood Engineering four-piston calipers, custom rotors
Ring and pinion: 6.33:1 or 3.73:1, depending on course

Wheels: 15x10.5 Pro Comp with custom bead locks
Tires: 31x12.50-15 Pro Comp Mud Terrain (front), Pro Comp Xterrain (rear)

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