6B8763 TRANSMISSION GROUP (First Type). Serial No. 7M1 to 7M1018 Inclusive. Provides the following speeds: (FORWARD) First-1.4, Second-2.2, Third-3.2, Fourth-4.6, Fifth-6.0, (REVERSE) First-1.6, Second-2.6, Third-3.8, Fourth-5.4 M.P.H.