![]() ![]() There are a few proven brands that correct it all AND increase acceleration substantially, but if the symptoms have been present for any length of time, wear and damage very likely has already started. According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses torque converter clutch (TCC) shudder conditions on 8L45 and. GM does not want the expense of replacing the torque converters so very few are able to get this under warranty, and it is just the same design they replace it with, again NOT addressing the cause, only the symptoms. ![]() ONLY a good proper designed aftermarket converter can correct the cause. ![]() With that said I was able to get mine replaced with the fluid/flush. West Metropolitan Regional Hospital Board 1973 2 All ER 260,19731WLR 601,117 Sol Jo 355, 9 BLR 60, HL. The shudder is from the fluid aerating and then it cannot provide the clamping pressure for the clutches and steels, and the metal HCI2000SS found is from the damaged caused by the shudder, and all will have this damage depending on how long the shudder was present. TSB 18-NA-355 is the one you want, but it also states to not replace the torque converter. Its been about 1000 miles since the TC replacement and it seems okay now. After the 200 miles, I took it back, they called GM and GM said replace the TC. My dealer said they wouldnt even look at again it before it was driven for at least 200 miles. However, a new fluid flush appears to fix the issues, with some customers beginning to report a dramatic change in shift quality after. When I had the TSB 18-NA-355 flush/fill done on my Colorado it came back. First, some customers report the transmission shuddering frequently. The flush is only a bandaid intended to get you past the warranty period, and then it is no longer a liability to the auto maker. The issues with the 8-speed GM transmission are two-fold. The symptom is from the stock converters poor design. Now, on the shudder issue and the fluid flushes. It is their responsibility, but it does not make the dealer or the tech any additional compensation, so the "run around" is usually given. If you encounter a vehicle with Torque Converter Clutch (TCC) Shudder prior to receiving tool kit DT-52263 please postpone the repair until you receive your tool kit. All DT-52263 tool kits will ship from Bosch no later than February 14, 2019. Techs are paid flat rate, so if there is a mistake they need to fix it with no pay for fixing it as they received pay for the first fix. Note: Required tool kit DT-52263 is shipping from Bosch. In January 2019, GM issued TSB 18-NA-355 entitled, Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed. The lawsuit names the following vehicles equipped with either a GM 8L90 or GM 8L45 transmission.ScatPack is correct. GM has issued 13 technical service bulletins related to shifting issues alone, but “none of the suggested repairs have remedied the problem,” the lawsuit says. One owner also said that his transmission shifted so harshly from “reverse” to “drive” that he nearly drove through his garage door. Drivers have said that the shift is sometimes so violent that it feels as if they have been hit by another car. This may also occur when the vehicles are accelerating in a single gear and not necessarily switching gears. When a driver accelerates or decelerates, the cars will reportedly hesitate and then shudder, jerk, clunk or “hard shift” when the automatic transmission switches gears. General Motors is facing a class action lawsuit that alleges some of its automatic eight-speed Chevrolet, Cadillac and GMC vehicles have a defect in their transmissions. GM Facing Class Action Lawsuit Over Transmission Problem Tsb (Technical Service Bulletin) 18-Na-355.
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