knock sound from rear when upshifting?
 

Right when I release the clutch there is a very slight knock sound. This usually only happens after around 10-15 mins and only when upshifting. It doesn't get louder if I speed shift. I crawed under the car to wiggly the driveshaft if it's loose and there is almost no play,but I can make it move maybe a 1/16 of an inch at the most.

Possibly a control arm bushing or maybe a torn torque box, but if it only does it after 10 or 15 minutes check the clearance of the exhaust system. See if it is hitting the axle or anything else.

I had the exact same problem and it was a nut that had come loose on one of the upper control arms. Make sure they're all tight.