Awesome truck. I recognize that flywheel on the floor, Cummins P/N 21010, that's the one I was snaffling up whenever I could find one to convert the old military 10 ton tractors to take an 855 Cummins as a replacement for the POS 765 V-8 they were built with. Once you had the flywheel for the Mack 705? push clutch the rest was easy, Did a bunch of those jobs in the early 2000's. BTW, the grind dimension was 1.970" from the friction face to the cover mounting surface. If it wasn't right when you started out, the clutch wouldn't live long.