Common fault on many cars not just volvo , it may simply be the clutch friction plate not fully clearing either the flywheel face or the cover plate . This can be the result of dust / rust build up on the input shaft . You won't notice it in the forward gears due to the synchromesh hubs doing their thing .
It may even be due to incorrect grade of gearbox oil causing drag that keeps turning the gears & crunching
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