4L60E Sonnax TCC Valve Removal Tool
thingiverse
Credit for this goes to Richard Wardell who is a transmission rebuilder that shares good tips and ideas on youtube. Here is the video where he shows the tool in action https://www.youtube.com/watch?v=qA-Z36-B5_g You will need a small piece of PVC Pipe to put into this to use as the cylinder. The tool basically allows you to use hydraulic pressure to get the Sonnax TCC Valve and Sleeve out of the valve body without destroying it. It took a couple of tries for mine to work, but it did the job. I just used PLA for the bottom part (I'd recommend making is solid at least in the pressure areas) and I think I used TPU for the piston.
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