![]() GM Part Numbers for 0.946 liter bottles will be provided at that time. The Mobil 1 Synthetic LV ATF HP fluid and the required tool kit will be available to all Canadian dealerships by the end of March 2019. The GM part numbers are not on the product. The new Mobil 1 Synthetic LV ATF HP transmission fluid is available in quart bottles (GM Part Number 19417577) and, for a limited time, in 55-gallon drums (GM Part Number 19417904) in most locations. dealerships through your local GM Oil Distributor. The new Mobil 1 Synthetic LV ATF HP transmission fluid is now available to U.S. There are three different fluid exchange procedures to follow, depending on vehicle application, so that an acceptable concentration of the new HP fluid is achieved in the transmission. The current fluid tends to be hydroscopic, or absorbs moisture, which increases the chance of TCC shudder. The TCC shudder condition is related to moisture content in the transmission fluid. Refer to the bulletin for additional information, including required shudder test conditions for each vehicle being diagnosed as well as the fluid exchange procedures. If TCC shudder is present, a vibration peak will appear within +/- 2 Hz of the frequency listed in Bulletin #18-NA-355. ![]() A screen print from GDS 2 or the PicoScope showing the TCC shudder event must be attached to the Repair Order hard copy. Use GDS 2 or the CH-51450 PicoScope to confirm that the concern is TCC shudder and not a tire/wheel vibration or a driveline vibration, for example. Constant throttle input on a smooth grade is needed.Ī shudder condition may also be a chuggle, surge or vibration condition. To ensure TCC shudder is diagnosed correctly, drive the vehicle on a smooth road with transmission sump temperature between 122☏ (50☌) – 158☏ (70☌). The new service procedure addresses shake and/or shudder conditions during light throttle acceleration between 25 and 80 MPH (40 and 128 KM/H) at a steady speed when the transmission is not shifting gears. All GM dealerships should receive the tool kits by the end of March 2019. 10) The tool kit began shipping to dealerships at no charge in late January 2019. The new fluid exchange procedure requires the use of the DT-45096 TransFlow Cooler Flush Machine and DT-52263 Transmission Fluid Exchange Tool Kit. TCC Shudder and New Mobil 1 Fluid ExchangeĪ new transmission fluid exchange procedure and a new formula of Mobil 1 Synthetic LV ATF HP transmission fluid have been released to address torque converter clutch (TCC) shudder conditions on 8L45 and 8L90 8-speed automatic transmissions (RPOs M5N, M5T, M5U, M5X) in some 2015-2017 Escalade, Yukon 2015-2018 Silverado, Sierra 2015-2019 Corvette 19 ATS, CTS, Camaro and 2017-2019 Colorado and Canyon models. The flush and fluid replacement procedure requires special tools and proceedure, but it should be a covered repair. that is, having the propensity to absorb moisture. It appears the problem is caused by the OEM trans fluid being "hydroscopic". The article details what "shudder" is, how to test for it, the cause and the prescribed fix. Checking out GM TechLink this morning I came across the following article anouncing a "fix" for the Corvette's 8 Speed Auto "Shudder".
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