Pilot bearing, 1F/2F/3F series engines
There's nothing worse than having to drop the transmission & transfer case and pull off the clutch to change a dried out pilot bearing. That's a lot of backbreaking labor that could have been saved by installing this top quality made in EU by SKF aerospace bearing filled with synthetic grease. Do yourself a favor and toss the $2 shielded bearing that comes with a typical clutch kit. Buy & install the longest lasting waterproof sealed bearing available. Your future self thanks you.