1980 84 TRUCK 1 24 MANUFACTURING SOURCE TRANSMISSION STAMPING INFORMATION Continued Automatic Transmissions not interchangeable between 1979 and 1980 models must have I D codes changed in accordance with the parts identification ccmmitteegrcund rules Thefellowing has been agreed to by the car divisions 1 Add the number 0 zero to designate model year after the ink stamped code letters on the transmis sion case the numeral is to be the same size as the code letter I 2 If any interim modal year changes are made to a transmission which would affect established EPA y gasoline mileage figures the part number and code letters must change If part number changes 1 should happen to result in depletion of available code letters then a two place code one numeric and one alpha can be used h V L TYPE DESIGNATIONS WILL BE LOCATED AS FOLLOWS All 3 Speed Manual on top right hand side of transmission case V Truck 4 Speed above power take off cover All 3 Speed Automatic on right side of transmission above filler plug Turbo Hydramatic on top right front l SERVICE SEQUENCING FOR SERVICE TRANSMISSIONS WILL DE AS FOLLOWS PARMA 00001 TO 14999 0 Y TOLEDO 15000 TO 24999 MUNCIE 25000 TO 44999 HVDRAMATIC 00001 TO 99999 l HVDRAMATIC TRANSMISSIONS WILL BE NUMBERED WITH THE LETTER H l l A 1 l GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52A 45