 They also replaced the original 2.75 to 1 rear axle gearing (standard, along with automatic transmission, on 1975 and newer Torinos) with numerically higher gears for better acceleration during stunt driving scenes; this was done during all four seasons to the S-G Torinos.Engine sounds were dubbed into the show soundtrack since the Torinos were mechanically stock; emissions laws forbade modifying the engines or emissions systems of new cars.When the pilot was successful, Spelling-Goldberg ordered two new 1975 Torinos for the first season.