I used to have retaining ring pliers for manual trans snap rings that were just bad *** and worked perfect for those rings as well.
They were made for example, for those big 1/8 thick input shaft bearing rings.
Fortunately they disappeared somewhere over the years after I got out of the trans business.
Mine were Snap On so they probably cost 80 bucks, but I really don't remember how much they were.
They were a life saver on tough snap rings.
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