The B&M TH-400 PreRunner/Trail automatic transmission is for RWD GM SB/BB applications. This transmission features a large diameter bushing for use with a large diameter yoke (1-7/8 in.) and a deep cast aluminum pan. This transmission also features a manual/forward valve body with a 2.48:1 first gear ratio, 1.48:1 second gear. Internal components include rebuilt front pump, B&M pressure regulator spring and shims, all new B&M high performance friction plates, new intermediate roller clutch, new kickdown band with welded anchors, machined center support with new case saver ring, all new thrust bearings and races and silencer ring. Max 600 HP / 550 Ft/Lbs. Intended for off road/trail use.