As with the front suspension, the rear suspension was designed specifically for the Goodyear Eagle 28.5x14.5-17 racing tires that will be used on the rear of the D-Max Type-R race truck.

With the massive torque output of the Banks-modified twin-turbocharged GM Duramax 6.6L V8 diesel, putting the power to the track became a critical part of the suspension design. Traction for acceleration was just part of the challenge. The D-Max Type-R also has to exhibit superior stopping and handling on the endurance road racecourses. The solution for the rear suspension system is a 3-link system. The 3-link design was selected for its simplicity and adjustability and is commonly used in short track racing. It uses two lower links running from brackets beneath and on each end the Speedway Engineering Track-Nine 9" Ford rearend housing to the chassis and a single upper link running from atop the rearend housing to the chassis. Final positioning of the link attachments is adjustable to tune the suspension for optimum performance. A Panhard bar, located behind the axle housing, provides lateral placement and stability of the rearend. A Howe adjuster at the right end of the Panhard bar allows it to be easily and quickly raised or lowered to alter handling characteristics. A Speedway Engineering tubular sway bar is mounted behind the axle housing controls rear body roll. The rate of the sway bar is tunable by substituting bars with different wall thickness.

As with the front suspension, the geometry and attachment points for the 3-link system were plotted using sophisticated computer programming. The rear of the chassis was then fabricated to accommodate these attachment points. Next, the actual suspension pieces were fabricated to properly locate and control the rear axle housing, wheels, and tires. The links were made of chrome-moly tubing and use high strength spherical rod ends. All attachment brackets are also of chrome-moly steel. Vertical movement of the rearend housing is controlled by Koni 2812 Mark II series double-adjustable coil-over shock absorbers with Eibach coil springs. Total suspension movement is approximately 4-inches. The lower mounts for the shock absorbers utilize billet aluminum inserts inside the lower link brackets. These are easily replaceable if they are damaged in a racing incident, or if a different length shock absorber is desired.

Rear Suspension Overview:

• Speedway Engineering Track-Nine 9" Ford
  rear-end housing

• Three-link system designed and built by Banks' Race Shop

• Koni 2812 Mark II series double-adjustable coilover shock absorbers

• Eibach 600# 8"-long springs plus helper springs