The LPC solenoid is identified by the blue electrical connector. The TCC solenoid is identified by the green electrical connector. The solenoid body contains 8 solenoids: 6 shift solenoids, SSA, SSB, SSC, SSD, SSE and SSF, 1 TCC solenoid and 1 LPC solenoid (figure 6). This transmission uses 2 types of solenoids: Casting-Integrated Direct Acting solenoids (CIDAS) and variable force solenoids. Check out the video in the 9T40 virtual training section of the ATRA website. Ford has the same type of tool which is #307-770. This is a Kent Moore tool #DT-47797 (figure 5). When the snap ring gets to the groove it pops right in! It takes so many headaches out of the operation. Use the press to compress the spring and the snap ring at the same time (figure 4). We install the spring and then the snap ring into the housing. The only method that I was able use to get the snap ring in is with this special tool. The return spring needs to be compressed so we can get the snap ring into the groove. The issue is getting the snap ring back INTO the groove. Just pry out one end pull the snap ring out of the groove until the return spring jumps out of the piston. I have worked on a couple of these and there is a special tool that will work on both the Ford 8F series and the GM 9T series for the return spring on the A clutch. In reverse, the diode is locked preventing it from rotating in either direction (figure 3). In 1st gear the diode functions as a standard one-way clutch. The servo piston then positions the CMD actuator lever into the desired position. Hydraulic actuation is achieved using a servo piston mounted to a lever of the Controlled Mechanical Diode (CMD) and is controlled through the valve body with a solenoid and clutch-select valve. It can also switch so that it’s locked in both directions. The SOWC is a hydraulically-controlled diode clutch that can operate in two different modes: First, it operates like any other mechanical diode it freewheels in one direction and locks in the other. This ultimately allows the transmission to fit into tighter spaces. The advantages of a SOWC include increased fuel economy, lower emissions and lower production costs, all while offering a more compact design. One of the many things about this transmission that makes it interesting is the “selective one-way clutch” or SOWC. The brake clutches are splined to the case and hold a component from rotating. The eight forward speeds are achieved by using just two driving clutches and four brake clutches (figure 2). T he GM u nits require the use of Dexron® 6 fluid. All the 8F series units use Ford Mercon® U LV. In 2019, Ford introduced the front wheel drive 8 speed which is very similar to the 9T GM front wheel drive series. We’ll take a look at some interesting features like the hydraulically actuated sprag and many other points that make this a unique unit.Īs with several other transmissions, Ford and GM have collaborated on the development of a series of 8 and 9 speed front wheel drive transmissions. In this edition of Fun with Transmissions we’re going to check out the new 8F35 from Ford Motor Company (figure 1).
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