So, my 10550 locks the rear wheels when I try to mow in reverse. It's most problematic if I'm on an incline and try moving backwards. Do you think the trans might still be partially engaged and that gravity may be taking over before the belt disengages? It also seems like the inside wheel locks when you turn it around to do the next row of grass. I know my silver and gold three speeds will do this if you have the bail partially engaged, so I am wondering if this is just a quirk with this machine or if it needs repair? Let me know before I tear into it. I'll probably make parts out of it knowing my patience level or lack thereof. The machine makes 115 lbs comp cold and the deck is mint, so maybe I'll just tear it apart as a spare should the 22261 have an "incident".