A clutch going out will slip. Input shaft bearings and or throw out bearings will give you noises that will change by either putting the clutch in or out and maybe will change upder load/not under load.

If this noise is only in 5th gear, it is probably something in the tranny.

Did the guy put gear oil in? We can't tell. Is it going to last a long time? We can't tell. Should you buy it? Your decision. At least you know the problem before you make the decision.

Steve G

PS And I did see this post in the talk section as well. Double posting is not the right way to handle this. You should have gone into the other post and posted a "BTT" (Back To Top) reply instead.