Quick view TCS Allison C2 Clutch Hub Shop with Blessed Performance for TCS Allison C2 Clutch Hub for your 2001-2024 Chevy/GMC Duramax Highlights: Made from 4140 HTSR billet steel. Zinc Chromate finish. Spline is lengthened .125″ for more contact, plus a spline boss... MSRP: Was: Now: $499.00 Add to Cart Compare