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Could be. But similarly from a cost of production standpoint I would think Volvo would eliminate the expense of machining that gear into a shaft where it is not needed. It's all about the nickles and dimes (kroner and ore?) in mass production.
Have a look at this thread and scroll down to Bruce Young's (Lucid) posting of Mon Jul 13 04:16 CST 2009 to see what this quite experienced gent has to say:
https://www.brickboard.com/RWD/index.htm?id=1359591&show_all=1
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Bob: Son's XC70, my 83 240, 89 745 (V8) and XC60. Also '77 MGB and some old motorcycles
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