Torque Converter Lock & Shift Schedule I've tried a few different approaches on the torque converter lockup and I'm running into what I think is overlap causing some issues. A faulty torque converter clutch can also cause other symptoms such as slipping and rough acceleration. Locking the torque converter in lower gears and shifting to the next gear locked can help get more power transfer to the ground where you need it. (Fig. To confirm TCC shudder, the vibration concern must be present in normal operation, but not present with the torque converter clutch disabled or with the torque converter clutch locked. I pulled once last year, starting in 2nd and ending in 3rd and didn't get much wheel speed from that! TCC clutch worn out (replace the torque converter). Over the years, it has started clunking...intermittently...in all gears, including the torque converter lockup in overdrive recently. This type of transmission tuning is commonly desired, especially when there is a monster under the hood- and the 68RFE especially shines with lock to lock shifts due to the close ratio gaps. I'm having a hard time picturing the best way to adjust as the axis values are different between apply/release and upshift/downshift. A malfunctioning torque converter can have a shudder that comes from the transmission. Hello Everyone, I'm having issues with my torque converter lock up, (03 4R70W), the converter is locking up fully way to early, sometimes 30 miles an hour at light throttle, and wont unlock unless I put a good amount of throttle into the car for a downshift. There are several clutches in a torque converter. The torque converter is a part of the transmission, and you will notice that the engine will hesitate and be underpowered when it is locked up. If TCC shudder is present, a vibration peak will appear at approximately 43Hz +/-3Hz. I just recently changed the fluid, filter dropped the valve body and shift kitted the car. There can be many different causes for certain engine problems. According to my edge insight, Torque converter will unlock when this happens and it starts to slip. I also noticed a shudder today on the highway in the transmission when in 6th and with torque locked upon light acceleration Sent from my iPhone using Tapatalk 4. Torque converter clutch doesn’t lock up: Brake pedal switches always on (switches need adjustment). On 12/13/99 when slowing down to make a left turn, the tourque converter locked up and stalled the truck in middle of traffic while crossing the left lane. This allows the transmission to … This combines the two separate halves of the torque converter, which improves the car’s efficiency because of reduced slippage. Bad Torque Converter Clutches– Modern torque converters will lock to create a true physical connection between the automatic transmission and the engine. TCC's typically don't lock during a pull and a transmission can still shift with the TCC locked. When I first bought the car, it only "clunked" when cold and shifting from 2nd to 3rd. Remember, a torque converter is a coupler between the engine and transmission. More modern iterations of the torque converter may come with a lockup clutch. Torque converter clutch always locked up, causing harsh shifts, or excessive engine drag off the line: TCC solenoid circuit shorted to ground. The slipping occurs while you're driving or changing gears, and it usually comes with some odd noises too. However, if you believe that the torque converter is locked … TCC solenoid failure. A bad torque converter will often run at a higher stall speed. The oldest problem is rough or clunky shifting (automatic transmission). When your vehicle is slowly coming to a halt, the torque converter only receives a small amount of torque. Also perform a TCC slip control test. 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