The weak mechanical low one-way sprag is replaced with a stronger roller clutch design that used a "cam and roller" system. The 4C clutch pack surface area is increased by 34%, using double sided frictions. The 2C clutch pack surface area is increased by 34%, using double sided frictions. The Over Drive clutch pack surface area is increased by 17%, also using single sided clutch plates, this allows for better clutch control when overdrive is used at higher power levels. The Under Drive (Forward) clutch pack surface area is increased by 21%, using single sided clutch plates. The clutch packs that are increased surface area listed below. In the case of the 68-RFE transmission, there is little room for additional clutches so modifications must be done to pressure plates providing increased clutch surfaces. Some of the areas that are addressed by ATS to complete the performance transmission upgrade package are listed below, starting at the front of the transmission working towards the back.Ĭlutch modifications are generally one of the most impactive and important items that can be upgraded in any transmission. Specifically, the light duty shafts and hubs, and the low one-way sprag these hard part weaknesses must be addressed. As well, the transmission hard parts have many limiting weaknesses which do not allow for increased power levels over stock. These enhancements, along with other key hydraulic modifications which ATS makes, must be done to ensure the clutch packs have the correct apply and release rates when commanded on or off. ATS has developed a combined technology utilizing recalibration of the hydraulic circuits inside the transmission, including revamped accumulator rates, reprogramed clutch to clutch apply and release timings, and line pressure rise rate to perfectly match the torque output of the engine. On a positive note, the technology that is utilized in the transmission is leading edge this advanced technology has forced the aftermarket to completely rethink how to modify and control the transmission so that it can still perform and remain reliable while modifying the engine to have higher power levels over stock. This approach forced the original designers to cut corners in size and quality of materials that could be used. This transmission was originally designed to be very inexpensive to manufacture. There are many things that need to be understood about the RAM 68-RFE transmission.
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