I sold my 1997 with an auto to a local guy so I could buy a friend's 2001 7.3 with a ZF6. Wasn't too keen on rowing gears all day. I've converted my Jeep and didn't think I'd get another manual, but they say the ZF6 is a very nice transmission. Keep in mind I had installed a full Tugger kit and a very nice torque converter in my last ruck. Shifted awesome.
But the new truck had a South Bend single disc clutch, single mass flywheel, new pilot bearing, and new hydraulics 20k miles ago. I'd try it.
3 months after I take possession I break a hub on the 1/2 syncro hub. I can barely get into 1st or 2nd. This is the first time I;ve ever paid anyone to work on a vehicle for me, I just didn;t want to invest in the puller and press needed for the mainshaft bearings. New master rebuild kit, new 1/2 hub assembly, all new syncros. New mainshaft also, the inout bearing hashed it.
I get the truck back after a $2k rebuild, 3rd gear grinds bad. All others are fine, clutch engagement was the same as before, maybe a little low on the floor. . Rebuilder says he'll split the labor with me to install a 3rd gear. Says ZF6s are a PITA.
A month and a half later, coming back from a trip the clutch hydraulics take a **** on me. Have to drive home rowing like a truck driver, and shutting off at the stops, starting the truck with the starter.
I install a Dorman master/slave kit. Shifts brand new. Clutch pedal is way high now, no third gear grind anymore. I was floored and happy I didn;t have to pay again or pull the tranny myself.
So...if you're having a 3rd gear grind and your clutch pedal seems a little low, maybe try the clutch hydraulics first.