The GE series Sigma was the first to introduce the Australian market to the "Astron" engine range. The 1.6-litre "Saturn" engine with four-speed manual transmission was also available in the base model, badged Sigma Galant. The "Saturn" engine was good for of power and of torque. The mid-range model, the Sigma GL, came standard with the 1.85-litre "Astron" and four-speed manual, providing and . Both Galant and GL had an upgrade option to the 2.0-litre "Astron" engine—standard with four-speed manual or optional five-speed manual or three-speed automatic.