sentences:  From 1994 until 1999, the M35A3 variant was introduced as part of Extended Service Program.Usually, A3 vehicles have a Caterpillar 3116 Diesel engine and had their manual transmissions replaced with automatic ones, as well as receiving numerous other improvements with a redesigned frontal appearance.No new A3 standard-transmission vehicles were produced, all vehicles being upgraded from previous configurations during the rebuild process.