I have a new development with my 65 Sport Fury. It seems to shift properly up through the gears and does not slip. Now if I am cruising at say 50 mph, and floor it to kick in the passing gear, it doesn't kick down into a lower gear. It seems to go into neutral until I let up then it goes back into 3rd gear. Anyone ever ran into that situation before? First time for me. Only thing I changed was my pan gasket was leaking and I had a new deep pan with a drain plug in it. I added the spacer and a new filter and put it back together. I can't see how that could have caused my issue. Is it an adjustment issue?
