I'm wondering if anyone offers a heavy duty clutch master cylinder for the 1988-98 Chevrolet/GMC half ton pickups. I drive my '91 Sierra hard, and typically never lift my left foot from the clutch pedal. I don't hold it in as I drive, but my foot rest there, and I believe that is wearing out my clutch masters prematurely. I've looked into the issue enough to know that it is the clutch master, not the slave.