Strongest gear set available with 9310 hardened steel, 4340 forged steel output 12 diametrical pitch tooth (1.5 times thicker than a 1.76 gear) Straight cut 1.80 gears means no thrust loading, less friction, quicker E.T.'s!!! Recommended up to 2000 HP New 1.80 ring gear with one year warranty on complete gear set All new pins, thrust washers, bearings, gear housing