Not likely, sounds more like something that was missed in the transmission especially associated with 5th gear, or even the u-joints. I once saw a similar issue, but it was in every gear that the floor shifter would oscillate, and I'd hear a slight hissing noise. I had a speed shop I knew well when racing my drag car rebuild the transmission while I change the u-joints in the driveshaft. Problem solved. Even the 4 speed transmission shifted like butter. Btw, the clutch had already been replaced months earlier by the owner as it was pretty well smoked.