Hi Art,
Found a link that will take you to a web site that has a part listing for the Ryobi P220 drill. It appears to me that Ryobi only offers the drill motor/transmission assembly as a repair part. That will likely be fairly expensive, and you can't use the motor. I guess you might want to get a price, and disassemble to see how it is built. Dewalt's are pretty cheap compared to most planetary gear transmissions I have seen. I do like the apparent gear ratios available with the Ryobi. Ryobi's 3 seem more useful then the Dewalt's 3.
