2006 Tiffin slide gears keep shearing

Sorry got back to everyone so long. Had a lot going on. I want to thank everyone for there input and help. It is a power gear set up. You can still get gears for these you just have to look around. I called Red Bay ( thanks mikestock ) they really didn't know but said they have replaced new gears with in a month and blamed them on material that they make them now days. But they sent me on the right direction. It turns out someone changed the motor out with a high tork that would be used in a Large slide ( looks the same ). To much pressure. Soooo be careful in or out Don't hold it on once in or out. Have two more spare gears till I will drop a dime on a new motor. Thanks again for everyone's help.