GM Delta platform

Delta was General Motors' compact front-wheel drive automobile and crossover SUV platform, a successor to the GM T platform; it also replaced GM J platform and the Z platform used by the Saturn S-Series. The platform debuted in the 2003 Saturn Ion. Vehicles of this platform generally carry the symbol "A" in the fourth digit of their VINs. The architecture was developed by Opel in Germany.

The Volkswagen Jetta is said to have been the target for the design group. Delta uses an independent suspension in front and torsion bar type in the rear. The Ecotec Family II engine is widely used, as are a 4-speed automatic and 5-speed manual transmission.

Applications
Current and former vehicles based on this platform:
 * 2003–2007 Saturn Ion
 * 2004–2009 Opel Astra
 * 2004– Opel Zafira
 * 2005– Chevrolet Cobalt
 * 2005–2009 Pontiac G5/G4/Pursuit
 * 2006– Chevrolet HHR

Delta II
Delta II is General Motors' future compact car platform, which was also developed by Opel. It is the successor to the GM Delta platform. Internally it is simply known as a new Global Compact Vehicle Architecture or GCV.

Applications
Production vehicles based on Delta II platform:
 * 2009 Chevrolet Cruze (Daewoo Lacetti Premiere/Holden Cruze)
 * 2010 Opel Astra (and Vauxhall/Chevrolet/Buick variants)

Announced production vehicles to be based on Delta II platform:
 * 2011 Chevrolet Volt
 * 2011 Opel Ampera
 * 2011 Opel Zafira (and Vauxhall/Chevrolet variants)
 * 2012 Buick sedan
 * 2012 Chevrolet Orlando

Potential vehicles to be based on this platform:
 * Saab 9-1X
 * Saab 9-3