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[canadiancelica]

Well, the gear boxes are known for that problem, BUT, its probobly your clutch. Its more then likely worn out and doesnt engage quite enough to open the synchros. The fact that you can rev up to let the gears engage says to me, clutch.

Get clutch plate, pressure plate and throw out bearing and have it all replaced. Get the clutch master and slaves and fluid checked as well.