Haven't had the opportunity to rebuild any light vehicle trans, but have seen this on some heavy equipment (tri-axle dump trucks) where the synchro's would start to wear causing it to grind/whine in gear. also noticed that the bearings were getting some wear causing some of the shims to get slapped around a bit and worn down. wasn't 100% sure as to the root of the cause, but replaced it all and never did it again. might as well spend the $10 for the flush and check the fluid for any signs of metallic wear/breakdown.
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There is no replacement for displacement...
99 Camaro Z28 M6 - Sold Aug 2013
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