You won't know it until the bearings start failing later on. With the preloads completely out of spec, the trans will go together, operate properly, and shift just fine. If the bearing preload is too low, then the rollers won't roll, they'll slide, skip, or skid and once a roller has a flat spot the bearing is doomed. If the bearing preload is too high, when they heat and expand they'll just burn themselves up. REBUILT O2J TRANSMISSION MANUALBearings are pretty close to each other but even when changing just the bearings I wouldn't even consider closing the trans up without at least checking the preloads. This Genuine Volkswagen Audi Remanufactured 5-speed Manual Transmission (KPF). They are each shimmed at the factory because not every case and shaft is exactly the same. If the parts were manufactured to such close tolerances then VW wouldn't build them with shims in 0.05mm increments. I would be surprised to see the preloads all fall into spec after changing the casing or shafts. Not always, but it's more likely to happen than if you change the internal parts (shafts or diff) or if you change the casing pieces. Found out later the gassers trans were exactly the same as mine: shape, shafts, syncros. Had to drive a couple hundred miles to pick it up, but it worked. Found all gassers on LQK, finally found an O2J on Ebay. With the bearings only being changed, you run a better chance of getting the preload back into spec if the same shims are used in the same locations. FWIW, when I rebuilt by 03 O2J trans, I shopped LQK and ebay. The manufacturing tolerances aren't tight enough to allow the parts to interchange without proper shimming of the bearings to put the preload back into spec. If you change the bearings, the casing, or the shafts that use the bearings then I would strongly suggest that the bearing preloads be checked and adjusted if required.
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