What GM manual transmission carries the number on the case GM8680834?

The GM manual transmission with the number GM8680834 on the case is the Muncie 4-speed transmission. This transmission was commonly used in various GM vehicles during the 1960s and 1970s, particularly in muscle cars like the Chevrolet Camaro and Pontiac Firebird. The Muncie is known for its durability and performance, particularly in high-power applications.