Q: Allison trans in 2001 gmc 2500hd will sometimes "whistle" when put in reverse

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When trans is hot and shifted into reverse (when stopped) it sometimes emits a "whistle" sound very much like a "backup warning" on a garbage truck. It is intermittant and does not seem to effect performance. Smooth shifts, trans temps getween 150f and 175f. New filter abd fluid in last 1500 miles

My car has 65000 miles.
My car has an automatic transmission.

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