TRUCK TRANSMISSION PRODUCTION CODE EXPLANATION Continued The following system will be used to identify service transmission assemblies r domestically Eroduced This number system applies to complete service trans mission assem lies only Transmission cases are no longer identified Manufacturing Plants w ll number each service assembly as it is produced The first letter will designate the GM Division which produced the unit c chevrolet The second letter will indicate the type of unit T Transmission The number following the letter will designate t e model year 9 1979 The last five digits sgecify the service rep acement sequence number The group of numbers to be used y Chevrolet Manufacturing Plants are as follows PLANT SERIAL sE0uENcE Tremec Ind Division of Clark Equipment 0001 to 9999 Chevrolet Parma Transmission Plant 00001 to 14999 Chevrolet Toledo Transmission Plant 15000 tc 24999 Chevrolet Muncie Transmission Plant 25000 to 44999 Hydra Matic 400 00001 to 99999 Hydra Matic transmissions will be numbered with the letter H regardless of the GM division using the transmission EXAMPLE Number CT 700175 designates chevrolet Transmission year and 175th unit produced for service at Parma 0pon completion of the serial sequence the plant will reuse the above numbers us ng a letter prefix such as A B or C to indicate late production transmission for example CTA 700000l snr 1990 GENERAL MOTORS SERVICE PARTS OPERATIONS LTTRUCK 52R 4 000 4 REV 9 90