You wouldnt think a particular gear should be troublesome but it can. I helped friend put new clutch on Ford 350 with the 7.3 diesel and a 5 spd. Reverse can still be a pain. Ford didnt allow for any adjustment on rod from slave cylinder to throw out arm. You end up spending day or two trying to bleed the system to absolute perfect and then find out that after milling the flywheel you were suppose to use special shims to make up the difference. By the way the master and slave are plastic and sold as a prebled unit for some ungodly price. I ended up welding couple washers on throwout arm and got it to work but as I said reverse still occasionally causes a problem. Why in the world Ford came up with this stupid design when they had perfectly good system previously is beyond me. Gets even better, the newer Fords (and Chevies too I think) now dont even have a throw out arm, the slave cylinder is now part of the throwout bearing INSIDE the clutch housing. Must save 50cents going down the assembly line but big pain in rear for everyone dealing with it after that. I am of the opinion that modern engineers take a special course in how to make life difficult for mechanics and how to make cars unnecessarily complex and expensive for buyers/owners.