Ive been lurking around this site for a while, and I thought Id ask my first dumb questions! Im having the manual trans and transfer case rebuilt in my 78 GMC 3/4 ton 4x4 Sierra Classic. They needed bearings, syncros, but no gears. Do I need to do any kind of break-in on it? Also, is the transfer case an all gear unit? These trucks must have been built well, considering they're the original units.