There is one bit of advice in the Lincoln owner's manual on shifting: When shifting from low to seacnd or second to high, Press down the clutch pedal, but delay taking out of the lower gear for a second or tw0, then hesitate in neutral momentarily before engaging the higher gear. The object is to synchronize thw clutch speed with the new engine speed. There is a knack to this, with any old car, but if driver tunes an ear to engine sound, and eye to caer speed, silent shifting can be achieved. A newly rebuilt clutych will release pretty easily, but as it is used over years, tiny bits of material worn off the disc lining find their way into the splines in the outer clutch member, and cause sticking, or drag, clutch not releasing completely. Hence the need to hold the clutch peday down at a traffic signal stop as described. I now have replaced 600W oil with 1000W, a semi-fluid grease, which slows the transmission gear spinning better than thinner oil.