The predecessor had a single overdrive that was a.
The 68RFE was also given two overdrive gears, with 5th being. Chrysler also increased second gear to a 1.83:1 versus the 1.45:1 found previously. The new 68RFE boasts a whopping 3.23:1 first gear, compared to the 2.45:1 first gear found in the previous 47/48RE platform. The tighter shift recovery essentially keeps the vehicle in higher averaged horsepower and torque numbers, while also adding torque multiplication. The additional gears allowed Chrysler to add higher 1st-gear ratios and tighter shift recovery from one gear to the next. For the 68RFE transmission, Chrysler opted to change to a six-speed unit. The first improvement Chrysler wanted to make over the Torqueflite platform was, obviously, the amount of forward gear. The 46/47/48 Chrysler platforms were 3 and 4-speed units that were mechanically and hydraulically controlled, with the most notable control system being governor pressure.
SUNCOAST 68RFE LICENSE
The previous platform utilized the Torqueflite 48RE platform and had been around since the late 50's when they released the first 727 in 1956 after purchasing the license from Simpson on the gearset in 1955. In 2007, Chrysler debuted the new 6.7 Powerplant in the all new Dodge Ram, and Dodge wanted a transmission that was specifically designed for function. The RFE design was mostly noted in the new design to have 3 planetary sets for a 4-speed transmission in the 45RFE. "RFE" stands for Rear-wheel drive Fully Electronic control. The RFE platform was originally designed by Chrysler and was introduced in 1999 with the debut of the new Jeep Grand Cherokee. The 68RFE transmission is the big brother to the 45/545RFE transmission.
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