4l60e troubles
The dipstick test method works too and sure is easier as long as you can read it accurately.
Assuming the converter is working, a torn input drum (where the input shaft enters) is the next most likely problem area. I recommend that this area be reinforced in all performance builds with the Sonnax input drum reinforcement ring kit.
But, it definitely sounds like something broke. It could be any number of things. You'll have to pull it apart and look...
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