Axle Set - Custom Order 40 Tooth Trophy Truck Spline 300M - Gun Drilled
SKU 32640
Category: Trophy Truck Custom Axles (40-Spline)
The 32640 series is a pinnacle-tier drivetrain solution engineered exclusively for elite, high-horsepower desert racing platforms like Trophy Trucks, Trick Trucks, and Class 1 unlimited buggies. Utilizing the industry-standard 40-tooth Trophy Truck spline, these custom-built axles are designed to transfer thousands of foot-pounds of torque from racing transaxles or heavy-duty rear ends directly to the hubs. Built to survive the violent, continuous shock loads of whoop sections and massive jumps, this axle set provides the ultimate combination of structural integrity and weight optimization.
Performance & Fitment
Application: Unlimited Trophy Trucks, Trick Trucks, and Class 1 Race Cars.
Spline Configuration: 40-Tooth Spline. This oversized, coarse spline profile maximizes surface contact area at the drive snout and differential side-gears, distributing immense torque evenly to eliminate sheared splines.
Diameter: Custom-sized to match your specific housing width and trailing arm geometry.
Position: Rear drive axles (compatible with heavy-duty full-floating rear end housings).
Design: Solid Axle Profile with Lightweight Modification. Engineered to serve as a high-strength torsional spring that absorbs drivetrain shock.
Premium Construction
Material: 300M Ultra-High Strength Steel. The absolute standard for premium off-road racing, 300M delivers unmatched tensile strength and exceptional fatigue resistance, allowing the axle to twist under load and snap back without permanently deforming.
Process: Gun Drilled Center. To optimize performance, these axles undergo a precision gun-drilling process that removes the "dead" material from the absolute center of the shaft. This creates a hollow inner core that significantly reduces rotating mass and unsprung weight, allowing for faster suspension cycling and quicker throttle response.
Strength Retention: Because torsional stress is carried almost entirely on the outer diameter of a shaft, gun drilling removes weight without sacrificing the axle's structural or twisting strength.
Precision Finishing: Every axle is centerless ground to eliminate surface stress risers and shot-peened or polished to maximize resistance to micro-fractures under extreme deflection.
🏁 Trophy Truck Drivetrain & Setup Notes
Running a gun-drilled 40-spline 300M axle requires precise installation protocols to ensure survival over a 500-mile desert race:
❌ Rotational Tuning (The "Fuse"): 300M axles are designed to act as a mechanical torsion spring. Under hard acceleration or landed jumps with the throttle pinned, the axle twists to absorb the shock load, protecting your expensive ring-and-pinion or transaxle gears from shattering.
❌ Gun-Drilled Internal Maintenance: The hollow inner bore must be kept completely free of moisture and debris. Silt or water trapped inside the bore can cause internal corrosion, creating a hidden stress point that can cause the axle to snap from the inside out. Always use high-quality silicon sealant or specialized end caps to seal the inner core.
❌ Drive Flange Inspection: Because 40-tooth splines handle immense torque, you must regularly inspect your drive plates/flanges for pocket wear or "egging." A worn drive flange will introduce slop, causing a hammering effect on the axle splines that will quickly deform them.
❌ Spline Lubrication: Liberally coat the 40-tooth splines with a high-pressure, high-molybdenum (Moly) racing grease or anti-seize during installation into the spool and drive hubs to prevent galling under extreme heat.
❌ Directional Memory Retention: Once these axles have completed a race or a heavy testing session, they take a permanent "set" based on the direction of torque. Mark them clearly as Left and Right. Reversing their rotation direction on the next race will untwist the steel grain, dramatically shortening the fatigue life and causing premature failure.
What’s Included
(1) Custom Order 40 Tooth Trophy Truck Spline Axle Set – Solid 300M
Warranty
Backed by a 1-year warranty for peace of mind.
Stock Information
Available on backorder.