Transaxle Shifting Problems

Hello everybody. I am having problems with my Transaxle on my sears off road lawn mower. The transaxle will not shift at all. I took the Transaxle a part, but I am still not sure why it is not shifting. Does anybody have any ideas of why it is not shifting? Any help would be greatly appreciated. Thanks

we need some more info! what kind of transaxle are we dealing with.
-transaxle make and model number
-#of gears
-previously disassembled?
-prior issues?

when you took it apart was it rusty inside? maybe water got into it and it seized it up.

Thanks for the quick responses, I was working on it for a while today and it was just a little bit rusted and seized. With a lot of oil and hammering I got it mostly working again. Sorry for wasting your time. I think Craftsman1998 was right and some water got in it. I resealed it and I think I am also going to reseal the Transaxle on another one of my lawn mowers just to prevent the same thing from happening again.