Odds are its the 3-4 synchro sleeve and hub. The synchros usually survive unless you have a SEVERE grinding issue... or the people that owned it before you just abused the tranny.
Unfortunately, you cant get hubs and sleeves individually for the 3-4 set, you have to buy the whole set. The part# is 23444-PNS-316 for your tranny. If you shop online its around $230+shipping, and includes the 3rd gear (which you prolly need), two synchro sets, the hub and the sleeve.
These parts go on the mainshaft, and i would advise changing the top mainshaft bearing as well. The part# is 91002-RAS-003, and is like $30.
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