80,000 miles ago I bought the SBC stg 3 kit, just looked I paid 759.00 for it back then. The stg 2 endurance is well over 100 less at 629.00. But I bought it in anticipation of a slipping clutch. Well at 203,000 miles, a 17/22, pp520s, and a RC4+, it's never slipped. Like never, so I've yet...