List of GM platforms
Beginning in the 2000s, GM instituted an architecture naming scheme using the English-language names of letters of the greek alphabet, for example, "Alpha." Despite this change in naming convention, many vehicles are still produced on platforms using the older, latin letter-designated naming scheme.
Under the older, latin alphabet letter architecture name scheme, General Motors applied each architecture to vehicle families aimed at similar market niches. For example, the E-body Oldsmobile Toronado personal luxury coupe was redesigned significantly through four generations from 1966 through 1992, but retained the same letter designation throughout that time.
In some cases, the architecture name was retained for a market segment even whhen the architecture diverged radically. In 1982, the GM A platform was re-designed, switching from rear-wheel drive to front-wheel drive. The former rear-drive architecture continued to be produced, but was re-designated the G architecture. In certain instances, GM has used varied letter designations for similar products. The recent G, H, and K architectures are reported to be closely related, but GM has given different letter designations based upon the model produced upon the architecture.
For the latin alphabet letter platforms, the architecture designation usually corresponds to the 4th letter of the Vehicle Identification Number. GM used these letter designations to identify service manuals, owner manuals, and other publications. In the past, the automotive press would promote visually similar car families based on their platform designation. (For example, the "X Cars".)
In production 
- Alpha - compact to midsize, RWD and AWD
- Delta - compact, FWD
- Epsilon - midsize, FWD
- Gamma - subcompact, FWD
- GM 4200 - subcompact, FWD
- Sigma - midsize, RWD
- W - midsize, FWD
- Y - sports cars, RWD
- Zeta - midsize to fullsize, RWD
Trucks and SUV's 
- GMT355 - mid-sized pickup truck, RWD and AWD
- GMT900 - full-sized pickup truck and SUV, RWD and AWD
- Lambda - crossover, FWD and AWD
- Theta - crossover SUV, FWD and AWD
- U - minivan, FWD
Current and historical applications 
As mentioned above, GM used platforms to make a hierarchy of models aimed at different market segments. The following table attempts to place each shared platform in context. As General Motors has integrated worldwide operations, platforms are now shared globally.
Front wheel drive 
Rear wheel drive 
GM reused some platform names between the front and rear wheel drive families.
GM also has/had a number of non-shared and international platforms:
- GM P platform - 1984–1988 Pontiac Fiero mid-engined sports car
- U platform - 1974–1980 Holden Torana Rear wheel drive compact
- W platform - 1980–1984 Holden WB Rear wheel drive full-size
- GM Z platform - 1991–2002 Saturn S-Series compacts
- GM/Fiat Premium platform - Alfa Romeo models
- Daewoo T platform - Daewoo Lanos, Daewoo Kalos, Daewoo Gentra
- Daewoo J platform - Daewoo Nubira, Daewoo Lacetti
- Daewoo M platform - Daewoo Matiz
- Daewoo V platform - Daewoo Leganza, Daewoo Magnus, Daewoo Tosca
Badge-engineered and non-GM products:
- GM M platform (Suzuki) - Chevrolet Sprint, Geo Metro
- GM P platform (Isuzu) - Chevrolet Spectrum, Geo Storm
- GM S platform (Toyota) - Chevrolet Nova, Geo Prizm, Pontiac Vibe
- GM InsideNews Platform Guide Note: last updated March 16, 2006