PARTS CATALOG INSERT. 7B717 TRANSMISSION GROUP. Effective with Serial No. 7M1522. Provides the following speeds: (Forward) First-1.4, Second-2.4, Third-2.9, Fourth-3.5 and Fifth-5.0 M.P.H. (Reverse) First-1.6, Second-2.9, Third-3.5 and Fourth-4.1 M.P.H.