1974 Trans Am Production Engine Vin Code Trans. # Built Total
400 T 4M 1,750
400 T 3A 2,914
Total 400 4,664
455 - Base Y 3A 4,648
Total 455 4,648
455 SD X 4M 212
455 SD X 3A 731
Total 455 SD 943
Total Trans Am 10,255
Color & Trim Codes
Exterior Colors Interior Colors Std Trim Custom Trim
Cameo White 11 Blue Morokide 811
Admiralty Blue 29 White Morokide 721 Morokide 921
Buccaneer Red 75 Red Morokide 901
Green Morokide 941
Saddle Morokide 731 Morokide 931
Saddle Cloth/Vinyl 831
Black Morokide 761 Morokide 961
Black Cloth/Vinyl 861
Engine Trans Engines RPO HP@RPM Torque@
Codes RPM 400 - Early 3-Auto AT, YT, YZ, ZT L78 S 225@4000 330@2800
400 - Late 3-Auto AD, YL, YM L78 S 225@4000 330@2800
400 - Early 4-Man WT L78 S 225@4000 330@2800
400 - Late 4-Man Y3 L78 S 225@4000 330@2800
455 3-Auto AU, YR, YU,YW L75 Y 250@4000 380@2800
YX, YY, YZ,ZU
ZX, ZW
455 SD 3-Auto Y8 LS2 X 290@4000 395@2800
455 SD 4-Man W8 LS2 X 290@4000 395@2800
Rear Axle Ratio & Transmission Codes Engine Trans Trans RPO Trans Code Axle Ratio Axle Code Useage
400 4M M22 3.08 All
400 3A M40 2.56 All
455 Base 3A M40 2.56 All
455 SD 3A M40 3.08 w/ Air Cond
455 SD 4M M22 3.08 w/ Air Cond
455 SD 4M M22 3.42 w/o Air Cond
455 SD 3A M40 3.42 w/o Air Cond
