Parts-TuningALLISON 4800 SP FOR SCS TRUCKS 1.35 July 1, 2019June 30, 2019 - Leave a Comment Version: 1.0 – New Allison 4800 Sp Torque Converter Transmission For Scs Trucks. – Peterbilt 389. – Peterbilt 579. – Kenworth W900. – Kenworth T680. – Volvo Vnl. – Real Gear Ratios And Torque Convert Ratio Used. Credits: Engineer Download mod File File size allison 18 KB Share mod: