transmission problem

[Hyena]

It isn't anything new but i guess it is time i asked the question.  My G-52 won't downshift from 4th into 3rd.  the shifter won't go into the gear like something is blocking it.  It doesn't grind at all, no noises.  Could it be a syncro (sp?).  I have a manual transmission class this semester for school and i need a project.  If i have enough money i can rebuild my tranny at school.  was wondering if anyone new what exactly is wrong with it.  Would the rebuild kit from Marlin fix it?

[DESERTCOX]

HAVE YOU CHECKED THE SHIFTER BUSHING AND SEAT   APARENTLY THE STOCK SEAT WILL DRY UP AND DISAPPEAR AND THAT CAN GIVE YOU SHIFTING PROBLEMS

[Hyena]

I guess i can pull the shifter out and take a look.

[91 super yoda]

mine does that when its cold. i have to be in neutral pump the clutch and it will finally slip right it. and sometimes its easier to shift withought the clutch at all.