whirling noise when in reverse

uk-barracuda said

went out in the car today, and the whining noise seems to of stopped altogether, it dosnt seem to do it in reverse niether now.

would it be ok if i left it.

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why not, if you end up pulling the trans you might as well rebuild it, so i would leave it alone if the trans fluid is up, you do check the trans oil level in N, not park-correct?