On my way home from work yesterday my transmission (6R60) got a case of the shudders...I felt it a while ago, but it wasn't that bad and actually went away for a bit.
Last night it was like highway rumble strips unless I turned off the O/D.
I had to work a half day today, so when my replacement showed up I was able to put it on a lift and do a drain and fill. A lot of people have said that gets rid of the shudder, I figured what the hell?...can't hurt.
So, I proceeded to drop the pan, the fluid was pretty brown and smelly. I have no idea when or if it's ever been changed.
I have a filter and drain plug kit, but they were at home and I wanted to put some fresh LV in there with a BG transmission conditioner...
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After cleaning the pan and gasket...
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...I put it back together and filled it up using our BG power steering machine, it sucks the fluid right out of the quart bottle.
If you've ever done this you know it's not a job where you can take a few pics as you go along. It's messy.
The result...it didn't shudder at all on my way home! It shifted very smooth and felt really good.
I am going to drop the pan next week and change the filter, I will do the drain plug kit at the same time.