[Hib Halverson]

In fact, your experience with the 8L90 fluid change to solve the torque converter clutch shudder problem, is rare but not uncommon because I have heard about other cases of dealers not flushing with the right fluid. Either dealers did not pay attention to what GM was telling them as far as how to "fix" the issue or they cut corners on cost by not buying the correct fluid.

Currently, the onlyfluid approved for use in the 8L90/8L45 is Mobil 1 Synthetic LV ATF HP.