The 455 HO GTO is a 4 Speed manual and the 455 SD Trans Am is equipped with GM’s Turbo 400 automatic transmission. According to the guys of Road Test T.V. Now after watching the video and if you listen to the GTO it sounds a little more healthier than normal. To be Honest the 1972 GTO 455 HO was only rated at 300 Horsepower with the new net ratings which was supposedly the true power of the motor with all the accessories attached and going through the transmission. The previous years all the motors had a gross Horsepower which… Read More