FFL is on all of them I think
D71 is ?
GMD ?
PDN should be PON which is pontiac plant final assembly
TT5 tungson headlamps
UA1 heavy duty battery
V73 ?
YT9?
11U should be color 19U is black
6Yx and 7Yx should be spring codes?
8pz and 9pz are rear spring codes