TRUCK TRANSMISSION PRODUCTION CODE EXPLANATION Continued The following system will be used to identify service transmission assemblies domestically produced This number system applies to complete service trans mission assemblies only Transmission cases are no longer identified Manufacturing Plants will 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 specify the service rep acement sequence number The group of numbers to be used by Chevrolet Manufacturing Plants are as follows PLANT SERIAL SEQUENCE Tremec Ind Division of Clark Equipment 0001 to 9999 Chevrolet Parma Transmission Plant 00001 to 14999 Chevrolet Toledo Transmission Plant 15000 to 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 CT900175 designates Chevrolet Transmission year and 175th unit produced for service at Parma Upon completion of the serial sequence the plant will reuse the above numbers using a letter prefix such as A B or C to indicate late production transmission for example 0TA7000001 31991 GENERALMOTORSSERWCEPARTSOPERAUONS lTTRUCK 526 4 000 46 1 91