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That explanation is sort of correct. The shims aren't there to determine any relationship between the drivers and the differential. What the shims do is *locate* the differential in space. Like somebody posted previously, if you remove both drivers, the differential falls down. The differential is suspended by the driver housings, each driver's housing has half of a tapered roller bearing in it, the other half is pressed onto the differential's ring gear assembly. The shims allow the ring gear assembly to be shifted from left to right inside the transmission case. This adjusts the way the ring and pinion gears fit together. To adjust the "fore and aft" fit of the ring and pinion set, the pinion gear housing is also shimmed when it is bolted into the transmission case. These shims all account for minor differences in the transmission cases and allow for the ring and pinion to be fit together in the best way (they are matched sets, which ride on each other in a specific place for best wear and lowest noise).
So. The shims must stay on the same side of the transmission case they started on. If you move them, you will dramatically shift the location of the ring gear, causing substantial wear on the ring and pinion, and also probably a fair amount of noise.
The driver cups themselves are irrelevant, they just slide into splines in the ring gear assembly.
Also as posted previously, its not a bad idea to replace the seals in the driver housings (the shaft seal and the o-ring to the case), also not a bad idea to replace the support bearings. Make sure to reinstall the driver housings in the correct orientation (i.e. not spun around), they are marked and have an "up" side.
Hope that helps...
posted by 66.220.248...
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