So with a pile of ring gear drums I just couldn't stand to throw away, I started on a quest to repair them. I've rebuilt automatic transmission for 40+ years and was always able to get remanufactured hard parts. At. $200 + new T20 ring gear drums are expensive. I started out salvaging the reverse teeth from drums that were not repairable. By machining the damage teeth out and pressing the insert in, then pinning in place I was able to effectively repair some. Wanting a hardened insert I sent a drum with insert to Whipper hoping he could cut the teeth for new inserts. He liked the idea but the correct gear cutter was way expensive. Next trick was to see if a waterjet cutter could copy the tooth pattern. I spent a lot of time with a draftsman making drawing and had aluminum prototype cut. Sent that to Whipper to check the tooth profile, all good. He suggested that the parts be cut from 1045 steel so they would harden well. Had a batch cut and did the machine work. Heat treat at home was a busts so again I sent them to Whipper to have treated with some of his products. Big thanks here Whipper it wouldn't have happened with out your help.
So far Ive installed 9 and have three in working transmissions. The inserts are harder than the factory teeth ,not quite as hard as drive plates.
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Originally Posted by ARGOJIM
