Pontiac GTO/GT-37 Illustrated Identification Guide!
#Th400 serial number decoding manual#
PD=400,Ram Air III,Ram Air IV, Applicationĭ & L Transmission**For more information on all types of Parts and Service for Classic and Current Musclecar Manual Transmissions check out this site.Exceptions are 1965, they were stamped them either on a metal tag or the low servo cover and in 1966 they were stamped on the low servo cover. These codes were stamped on a metal tag located on the right side of the transmission.Source Serial Number Code/Plant Prefix Letters Prefix Some late model 1967 and beginning in 1968, the car's last eight numbers of the VIN were stamped on the transmission.In 1967 the serial number was changed, it consisted of a plant prefix letter, year number, and month produced (with a letter code instead of a number).Įxample: N7C18=Muncie,4 Speed built on March 18. Example: R520N=Muncie,4 Speed built on May 20 during the night shift. From 1964-66 transmissions carried a source serial number, which consisted of a plant prefix letter, a production date and a day/night shift suffix. Manual transmissions were stamped on the case. These codes were stamped on the left side near the top forward of the housing.Source Serial Number Code (Automatic & Manual) Pontiac Muscle Car - Pontiac GTO Transmissions 1.
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