My experience with the 4l60 and 4l60e is simple. When it does this in the C4.
Check fluid. If color is pink, thats a plus.
The transmission is a E version, meaning its electronically adjustable, via tuner for harsher shifts etc. If none of this has been done, you lost 3rd, the transmission is probably dying. I have lost several 4L60 right after 3rd went away..
At your mileage, I would at a very minimum, change fluid and filter..
Solenoids. Thats a tough one. If they get stuck, they wont work. But, that is why I recommend a filter/fluid change, to start.
If you are going to change anything in the clutch packs etc, might as well rebuild the whole thing with far superior parts, like from Dana at ProBuilt automatics.
Dont drive it anymore..
4L60/Es weakness is 3rd/4th gear band..
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