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I have a cottage industry rebuilding Model A rear ends. In the past 20 years I have removed several hundred pinion gears using the method I posted previoulsy and I have never damaged any threads.
I would be nervious putting a pinion gear attached to a drive shaft under a 20 ton press. I would be afraid that the excessive pressure would mushroom the threads. A sharp blow with a hammer while under much less pressure seems to do the job.
Tom Endy