I have a Southbend 13" OFE in my 99 dodge with cummins and NV 4500. My clutch does not always release and pulls the engine down and then there is a slight bang and all is fine. Sometimes I must shutdown to get transmission in gear. This is intermittent it is not always a problem. There are about 5,000 miles on the clutch. There is always pressure on the clutch when depressing and no leaks around master or slave cylinders. It is getting spooky coming to stops so Help please. . any ideas?