Diversified Machine Torque Tube

Diversified Machine Torque Tubes: Precision-Engineered for Short Track Racing

When it comes to the torque tube — one of the most stress-critical components in a sprint or midget car's driveline — few names carry more weight on the short track than Diversified Machine (DMI). Torque tubes serve as the structural backbone connecting the quick-change rear end to the chassis, transmitting all the rotational and braking forces that pound a race car lap after lap. In that demanding environment, material quality and surface treatment are not optional upgrades — they are the difference between a podium finish and a DNF.

Aluminum Construction Meets Race-Ready Surface Treatment

Diversified Machine's torque tubes are purpose-built for competitive racing applications. DMI's aluminum torque tube lineup is available in multiple lengths to suit different chassis configurations. Crafted from high-strength 2024-T3 aluminum, these tubes deliver the ideal combination of durability and lightweight performance — a critical consideration in classes where every ounce of unsprung weight matters.

What truly sets DMI torque tubes apart is their two-stage surface finishing process. Each tube undergoes hardcoat anodizing followed by a PTFE (Teflon®) coating, ensuring an ultra-smooth, low-friction operation with a "no bind" feel under stress. This results in consistent power transfer and improved suspension articulation, allowing the chassis to react predictably as the suspension cycles through rough dirt track surfaces.

For racers seeking maximum performance, DMI also offers the Platinum Reserve Billet Torque Tube (PRC-2390), machined from 7075 billet aluminum — one of the highest-strength aluminum alloys available — taking the one-piece design to an elite level for top-tier competition.

A Brand Built on Short Track Success

DMI didn't arrive at this level of refinement overnight. The company began in a two-car garage in Lancaster, PA, and grew into a manufacturer whose components are trusted across the most demanding forms of short track racing. Today, DMI operates out of a 66,000 sq. ft. manufacturing facility equipped with state-of-the-art CNC machining centers, live tool lathes, wire EDM, and CNC CMM inspection equipment — all dedicated to racing components made in the USA.

DMI's reach in midget racing is especially notable. The Bulldog Quick Change Rear — DMI's signature product — is recognized as the top rear end chosen in the world of midget racing, and DMI's complete line of midget driveline components, including these torque tubes, are engineered to work in concert with that system. DMI and Bulldog components have been found in victory lane from the Chili Bowl to IRP, and the last 17 USAC National Championships have been claimed by Bulldog Quick Change-equipped cars.

The Right Torque Tube for Your Application

Whether you're campaigning a midget on pavement or dirt, DMI's torque tubes are available to match your specific chassis requirements. Key product variants in the lineup include:

• MRC-2390 / DMIMRC-2390 — Aluminum torque tube in a silver/black finish, designed specifically for midget driveline applications
• SRC-2393 — Aluminum lightweight (LW) torque tube in a 28-inch length for sprint car setups
• PRC-2390 — Platinum Reserve one-piece billet 7075 aluminum torque tube for maximum strength and minimum weight
• Standard aluminum torque tubes available in 28-inch and 32-inch lengths with powder-coated magnesium base options

Explore the full torque tube category or browse the complete Diversified Machine parts catalog to find the right combination of driveline components for your race program.