You are more likely to have caused damage to your shift lever and/or seat/socket than to have damaged a shift fork.
It is fairly common for the bushing to wear out. Depending on the habits of the driver, the end of the shifter will wear right through 1 side of the bushing and cause metal-to-metal contact with the shift shoe inside the transmission. We have customers say our socket does not fit their transmission properly, and this is actually a result from this metal-to-metal contact that has deformed and elongated the shift shoe inside the transmission from many miles of use with a worn out bushing. I'd say about 4 out of every 10 shifter cores we get have worn out bushings. Certainly not as common as the seats, as you have mentioned, but in my opinion still something that should be serviced.
We try to hold to the original Toyota terminology where ever possible, in which case these two components would be called the "seat" and "bushing", respectively. For a while we called the bushing a socket. When we decided to update this name to "bushing", it was decided due to how many "socket" search hits we get that it would be best to retain our legacy term for the bushing, however on our product page (http://www.marlincrawler.com/transmi...t-lever-socket
), we do call it by its proper Toyota name right in the first sentence
These parts may themselves last for years, but the shifting performance, especially from the cheap aftermarket options, will not last for years. This is the whole reason why we created our heavy duty parts in the first place. If you want shifting performance
that lasts, then I firmly believe you cannot beat our HD components. As for my experience, I run these in my personal rig and have never looked back.