by all GM divisions, and formed the basis for the company's modern Hydramatic line. The basic rear-wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverse Turbo-Hydramatic 125 , and the longitudinal Turbo-Hydramatic 425 . A third variant was the light-duty rear wheel drive Turbo-Hydramatic 180 used in many European models.