Quote:
Originally Posted by KingLT1
The issue is when the transmission is locked up and cruising at a steady speed, the front pump is running at a low pressure. Because of this the TCC clutches are not getting enough pressure applied when transitioning from V4 to V8 and you get the shudder. The 6l80 in the L99 equipped 5th gens didn't have this issue because the transition from v4 to v8 was much more abrupt due to the tuning. GM wanted the 6th gen to shift and transition from v4 to v8 mode seamlessly and this is the result.
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Not exactly correct. GM started pulsing the TCC solenoid in alignment with the deactivated cylinders to mask the natural jittery feeling and pronounced transitions in and out of AFM modes. All the damage is a result of the pulsating lockup of the TCC. A tune alone will actually rid you of the problem if you disable AFM. If there was a way for us to remove the solenoid pulse procedure from the AFM mode of the 8L TCM it would feel just like a L99 5th gen did and we wouldn't be having dirty fluid issues.