Does anyone here know or have a list of all the GM designations for the various model cars and what their in-house name is. Obviously I'm aware of the firebird/camaro platform as the F-body and the vettes are Y-body, I'm also told that Impala/Caprice are B-body, but I don't know any others.

 

every body line (vehicle) has a designation, it would take a very long time to list them all...

 

...but here you go anyways

GM Passenger Vehicles:
A - 64-80: RWD Cutlass/Skylark/Chevelle/LeMans/Malibu/Regal/Special
82-96: FWD Ciera/Century/Celebrity/6000
A Special - 68-80: RWD Monte Carlo/Grand Prix

B - 62-95: RWD Delta
88/LeSabre/Caprice/Bonneville/Roadmaster/Parisienne/Catalina/Impala,etc.

C - Dn-83: RWD Delta 98/Electra
84-Up: FWD 98/Park Ave

D - Dn-96: RWD Fleetwood/Sedan DeVille/Limo

E - Dn-94: Toronado/Eldorado/Riviera

F - 67-up: Camaro/Firebird

G - 81-88: RWD Sedan Cutlass/Regal/Malibu/Bonneville
95-up: FWD Aurora/Riviera
G-Special - 81-88: RWD Coupe Cutlass/Regal/Monte Carlo/Grand Prix

H - 71-79: RWD Vega/Astre/Monza wagon/Sunbird wagon
85-Up: FWD Bonneville/Delta 88/LeSabre

H-Special - 75-80: RWD Monza/Starfire/Skyhawk/Sunbird
(excluding wagon)

J - 81-Up: FWD Firenza/Skyhawk/Sunbird/Cavalier/Sunfire

K - 85-Up: FWD Seville
K Special - 84-Up: FWD Deville/Concours

L - 87-96: FWD Corsica/Berretta

M - 85-Up: FWD Chevy Sprint/Geo Metro

N - 85-Up: FWD Calais/Somerset-Skylark/Grand Am

P - 84-88: Fiero
97-Up: Electric - EV1

P-90 - 1997-Up: FWD Malibu/Cutlass

S - 84-Up: Chevy Nova/Geo Prizm

T - 74-85: RWD Chevette/T-1000

V - 97-Up: RWD Cadillac Catera

W - 1988-1997/98: FWD (GM-10) Cutlass Supreme/Regal/Grand Prix/Lumina
1997/98-Up: FWD (MS-2000) Intrigue/Monte Carlo/Grand
Prix/Century/Regal/Impala

X - 62-79: RWD Nova/Omega/Ventura/Apollo/Phoenix (also the original RWD
Seville)
80-85: FWD Omega/Skylark/Phoenix/Citation

Y - 53-Up: Corvette

Z - 58-69: Corvair
90-Up: Saturn

GM Trucks:
C - All: Full Size 2WD Pickup
Dn-87: 2WD Blazer/Jimmy/Suburban/Crew Cab
92-Up: 2WD Tahoe/Yukon/Suburban/Crew Cab

G - All: Full Size Van

K - All: Full Size 4WD Pickup, including Blazer/Suburban/Crew Cab except
88-91
Dn-87: 4WD Blazer/Jimmy/Suburban/Crew Cab
92-Up: 4WD Tahoe/Yukon/Suburban/Crew Cab

L - 91-Up: AWD Astro/Safari

M - 85-Up: 2WD Astro/Safari

P - Delivery Van

R - 88-91: 2WD Blazer/Jimmy/Suburban/Crew Cab (old-style body)

S - 82-94: 2WD S-10 Pickup/S-15 Pickup/S-10 Blazer/S-15 Jimmy
95-Up: 2WD S-10 Pickup/Sonoma/Blazer/Jimmy

T - 82-94: 4WD S-10 Pickup/S-15 Pickup/S-10 Blazer/S-15 Jimmy/Bravada
95-Up: 4WD S-10 Pickup/Sonoma/Blazer/Jimmy/Bravada

U - 88-96: Lumina APV/Trans Sport/Silhouette
97-Up: Venture/Trans Sport/Silhouette

V - 88-91: 4WD Blazer/Jimmy/Suburban/Crew Cab (old-style body)