Wavetrac Differential, Porsche 915 18T: 911, 930 1974-77
Specifically engineered for 18-tooth coarse spline Porsche 915 applications with an 8/31 ring and pinion offset, this Wavetrac Differential delivers modern performance technology to classic drivetrains.
Starting from a clean-sheet design, the Wavetrac features optimized gear tooth geometry that improves strength and oil film retention compared to conventional differentials. Its compact internal gearset reduces rotating mass without compromising durability, while reinforcement in the side gear and axle interface ensures reliability under high power loads.
What truly sets Wavetrac apart is its patented internal cam mechanism — the only one of its kind on the market. It maintains drive force to the gripping wheel even when the opposite wheel loses traction and axle load drops to zero — a situation where typical torque-biasing diffs fail.
Built in the USA by Autotech Driveline, the differential includes:
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9310 alloy steel internal gears
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Case-hardened billet steel housings
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ARP high-strength fasteners
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Limited Lifetime Warranty – fully transferable
Ideal for classic Porsche owners looking to bring modern handling and traction benefits to vintage performance.