Shift solenoid e8/5/2023 Place the input-shaft/forward-drum assembly onto the pump ( Figure 7). Place the complete pump assembly on the converter that you are going to use. Here is a test that you can do while building the transmission: Unfortunately, we cannot see these seals, as they are inside the converter. A leak from these locations can allow fluid from the rear TCC to enter the front TCC and not allow the clutch to apply fully. Some of the most common, shown in Figure 6, are a damaged seal for the input shaft (1) and a worn or damaged sealing ring that seals the fluid between the turbine and the clutch and damper cover (2). The other place that can cause the P0741 is inside the converter. When rebuilding this unit you must look carefully for a worn-out valve-body bore at the TCC control valve and worn-out bushings at the pump stator on the location shown in Figure 5. As the SSA is gradually modulated to 100%, the fluid present between the converter cover and the converter clutch is eliminated to fully engage the TCC ( Figure 4). This allows the SSA solenoid fluid to be present between the converter cover and the torque-converter clutch, thus not allowing the clutch to engage. On the other hand, if the computer decides to apply the TCC gradually, SSA is modulated to about 50% when the SSE is turned ON. This ensures that no fluid will be present on the front side of the converter that is, between the converter cover and the converter clutch. If the TCC is to be applied directly without gradual application, the SSA will be ON 100% at the moment SSE is turned ON ( Figure 3). Since SSA is a normally open solenoid, when it is at 0% duty cycle it produces its maximum pressure, whereas at 100% duty cycle it produces 0 psi. The SSA solenoid, which is a PWM solenoid, is used to control the rate of apply. To apply the TCC in fourth gear, the SSE solenoid must be turned ON. When the TCC is not engaged, fluid is present on both the front (TC/F) and rear (TC/R) of the torque-converter clutch, thus keeping the clutch from applying ( Figure 2). Before we mention the fix, let’s see what is involved in applying the torque-converter clutch. The shop had replaced the valve body twice, installed a new pump, bypassed the cooler and replaced the converter twice, but the problem persisted. With this being said, there are 5 questions above we need you to answer in order to help you figure this out. I am confused why a transmission shop would allow the truck to leave the shop without the converter clutch functioning This means the re-agents in your transmission fluid are going to deplete far faster than they would if the converter is functioning properly. When the converter doesnt lock up, any fresh fluid that was recently put in the transmission is going to get very hot and possibly overheat. ĥ - When you pull the dipstick to inspect the transmission fluid level with the engine running in park, Hows the fluid level and what color is the fluid ?. Your going to go through a tank of gas very very quickly. ġ- How long has it been since this repair at AAmco was made ?Ģ Did your buddy take the truck back to the transmission shop to have it looked at when the problem didnt get repaired ?ģ- Was there any warranty placed on the transmission when AAmco went in and fixed the overdrive problem ?Ĥ- Do you have any paperwork showing the parts that were installed ?Īs mentioned above, its not a good idea driving around without the converter clutch not functioning properly. Most transmission shops give at minimum 90 days warranty. If AAmco was already in there making repairs, chances are its a wiring issue or lets at least hope its a wiring issue. TRD rear slider sticker with devil horns ( $6) Winter tires - Good year P265/65R17 Ultra Ice studded Summer tires - Good year silent armor P265/65R17 Joined: Member: #90305 Messages: 7,016 Gender: Male First Name: Canadain bumper technician Great white North 51.0333° N, 93.8333° W Vehicle: 4x4Limited leather package TRD Sport Rally -5 speed automatic Limited ,Factory heated leather seats ,chrome package,Super white with front windows tinted to 35 %
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