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I don'y find Simon's reply very enlightening: by "stay where they are" does that mean traveling with the drivers when swapped or staying on the same side of the differential? CMyles is the authoritative source for all things transmission and may perhaps drop in to clarify. I'll give you my take:
First, consider where and why spacing is important. The drivers are not in any way adjustable and I hope that you will grant that they are machined to consistent dimensions-- the most important being the output shaft end that engages the differential/pinion bearings. The differential gears and bearings are adjusted to accommodate the cumulative sum of displacements from idealized gear and transmission alignments. There is likely some means of up-and-down adjustment available to 'tune' the differential; the driver shims help to 'tune' the in-and-out engagement of differential gears with the output shaft of the drivers.
For simplicity, let's assume that all shims on either side of the differential are of uniform thickness but the passenger side has 3 while the DS has just 2. That difference was deemed by a technician at some point along the way to provide the best fit between drivers and drive-train-- the sweet spot of engagement was skewed just a bit towards the PS so an additional shim was added to the driver mount.
Given that scenario, let's imagine what would happen if, when swapping drivers, the shims stayed with their respective drivers: the 3 shims newly positioned on the DS leave the shaft of that driver beyond the optimal distance and the lack of a shim on the PS results in, as I picture it, crowding of the differential. That's not a place that you want to be.
Anyway, that's how my simple mind rationalizes the basis for keeping the shims for inner drivers in place RELATIVE TO THE TRANSMISSION in the event that you swap or otherwise replace drivers. I hope this is right(!) and, if so, that it helps.
posted by 96.42.3...
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