I've been a member of POCA and PI since 1984 and don't think I've ever heard a single instance of a ZF breaking due to sheer horsepower or torque, in a street driven Pantera. In fact, the only time I've ever heard of a ZF breaking was in the BMW M1 Pro-Car Racing series. The breakage only happened when the M1's were racing on a wet track that was drying out. The huge rear slicks would hit a puddle and spin to 9,000 RPM. The slicks would then hit dry pavement and with their immense grip, would cause a huge shock to the ZF, occasionally snapping the input shaft. In fact, those M1 racing ZF's were fitted with smaller diameter input shafts than the ZF's that came in the Pantera.
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