I don’t have a code book, only codes I’ve picked up here and there (so is by no means complete).
So, if I’m reading correctly, the tag says:
M31 M43 M55 N37 R22 CTD
H51 J52 K6V K8X M21
C16 C56 G11 G54 G66 G76
PX3 U 1 A57 A66 B41
PX3 D6X9 000 328 273631
E44 D32 HL29 G7B 337515
If so, the codes are:
M31 - Belt Moldings - Door/Quarters
M43 - Grill Surround Molding
M55 - T-Bar Roof - Special Handling/Contractor
N37 - Catalytic Exhaust System
R22 - Radio AM Mono / 8 Track (4 Speakers)
CTD – Continued to another tag
H51 - Air Conditioning w/Front Heater
J52 - Hood Release - Instrument Panel Mounted
K6V - Body Side Molding Type 2 / x=Color (Road Runner/RT/Super Pac only)
K8X - Tape Stripe Type 8 / x=Color
M21 - Drip Trough Moldings
C16 - Center Console
C56 - Low Back Bucket Seats-Non Recliner - Standard
G11 - Tinted Glass - All Windows
G54 - Left O/S Mirror Chrome Racing
G66 - Right O/S Mirror Chrome Racing
G76 - Dual O/S Mirror Chrome Racing - Remote
PX3 - Upper body paint code – Formal Black “Sunfire” Poly
U 1 – Built to USA standards
A57 - Road Runner/RT Package (F-Body)
A66 - Super Pac (F-Body)
B41 - Power Front Disk/Rear Drum Brakes
PX3 – Lower body paint code - Formal Black “Sunfire” Poly
D6X9 – Interior Trim code (black with bucket seats)
000 – Interior paint color (if different from body color)
328 – Vehicle was built on March 28, 1977
273631 – Vehicle Order Number
E44 – 318 2-bbl
D32 – A998 3-speed automatic transmission
VIN details:
H - Volare
L – Low trim level
29 – Special Coupe
G – 318 2-bbl
7 - 1977
B – Hamtramck, MI is assembly plant
337515 – Sequence Number
BudW