In the MR2 turbo transaxles, when the synchros are wearing using
Redline Lightweight Shockproof works very well. Getting into 2nd and 3rd was notchy and putting the Shockproof in was like magic. The tranny shifted beautifully.
It's pretty expensive (3qts will cost $45) but if your free stuff doesnt work it might be worth a shot. Cheaper than a new (used) tranny and easier than pulling that mutha! I don't know if the Shockproof meets RETed's GL standard but the Toyota was from the same era as the FC. Of course it could destroy your tranny. You'll have to decide if yours is far enough gone that it is worth taking a shot. As always up to you.