There are a few things I would suspect. One is the mainshaft outer case bearing, 999.110.025.00.
But imo, the more likely culprit is a needle bearing. There is one running under the 5th gear or could be one of the couple needle bearings associated with the reverse gear.
How long do you have until it fails catastrophically? Nobody knows. Could be 100 miles, could be another 10,000.
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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
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