When changing gears it makes a clunk if I shift a little slow or with out the clutch, but when you push it and shift fast it doesn't make a noise. Looking for what it could be before it get worse and possible breaks?

 

I would like to know the answer to thisl! Mine does this also! I taken my truck to several transmission shops and they all said they did not know without tearing it down which one may as well replace the clutch. I suspect the bearing on the flywheel is not adequate. When I replace the clutch, I will fix that.

 

I checked it out this week and found I had a u-joint badly worn. Changed it out and the noise has now gone. You might want to check that