1992 Celica

Generally not the whole transmission, no. Synchros and other wear items by need replacement, but the case and shafts should be alright if the unit was maintained and not abused. What is the concern with yours?

It is my daughters car. It has been hard to get it to go into gear...in fact she said one night it simply wouldn't go in gear but later it would. Also sometimes it, she says, will slip while driving down the road in 5th gear or whatever gear she is in at the time. But she said the RPMs didn't race when it slipped..... so I will post more later... Bill

Sounds like the clutch is going. If not, then probably the synchros. Chances are she's been really hard on the clutch... young women tend to treat clutches really really bad.