A new electronically controlled automatic transmission is available with the 4.7 V-8, which was designed specifically for this type of application. The 45RFE transmission's First and Reverse ratios are a killer low 3.00:1, which really helps to improve acceleration, towing, and four-wheeling. The neat part is the two different Second gear ratios: a 1.67:1 ratio on the upshift, and a 1.50:1 ratio on the manual downshift. For forced kickdown shifts into Second, the computer decides which ratio is better, depending on the speed and the throttle position. Combined with a 0.75:1 Overdrive ratio, this tranny contributes to better fuel economy and overall smoothness when shifting.
