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Does anyone here remember the Blue Bird "City Bird" transit bus? It was produced from 1976 to 1986. For most of its run it used a Detroit Diesel 6V53 engine (naturally aspirated to 1979; turbocharged from 1980), switching to 6V71TA power for its last two model years (1985-1986). Engine list: Detroit Diesel 6V53N (1976-1979) Detroit Diesel 6V53T (1980-1984) Detroit Diesel 6V71TA (1985-1986) Transmission list: Allison MT640 (1976-1977) Allison MT643 (1978-1984) Allison MT644 (1985) Allison MT647 (1986) Hear a 1983 City Bird in action: https://www.youtube.com/watch?v=3Ip2uNRyYVg (audio and picture by Marcos Ruiz) ~Ben