Quote:
Originally Posted by JT58
It's a design flaw somewhere. I suspect it's a tolerance issue or something in the manufacturing process regarding the orifices and size/restriction causing the shudder in the transmission. I think this since not all transmissions experience it. They are trying different fluids to see which ones will lessen or eliminate it. It's got to be the something like that as when mine did the shudder it only did it when the car reached operating temperature or the fluid was hot and thin. The hotter it was the more shudder. I knew it was not going to be addressed- and even if only 10% of vehicles have it that still a lot of vehicles between Camaros, Silverados, Colorados and Vettes.
I have to wonder how this transmission will be once out of warranty- how durable, will the shudder be worse than ever, etc.
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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.
I can say this...the only thing so far that has proven to be a 100% fix with no return issue is replacing the converter with a Aftermarket unit from FTI or Circle D and a tune.
Every other solution has had some issues come back...trans flush, trans flush & stock replacement converter...etc. Some folks including myself were able to fix the issue with tuning alone before there was a problem, others have not been as fortunate.
My issue is, if all of the vehicles out there with shudder that keep getting driven that way has to be causing premature wear on the clutches. Then the transmission valve body and what not is also pumping that clutch material through the system. Sure the new fluid might be a fix on a transmission and converter that has not experienced the issue, but I am not confident it's a real fix for a pre-existing problem because the damage is already done.