Its not stuck in gear like I am used to...its a sm465 with the manual linkage. No idea on the age of the clutch but after this weekend's wheeling trip it has tons of slippage. I can't increase RPM's over about 500 at a time without it slipping. I tightened the luinkage to the tightest its ever been since I have owned the truck and yet it still slips....is it on its way out? Or just still adjusted improperly?