There are several potential causes — such as a simple low transmission fluid level or a major internal pressure loss. (articles.orlandosentinel.com)
Hi There, What you are describing sounds like possibly low transmission fluid, a bad speed sensor or potentially a faulty transmission control module, which also controls the speed sensors. (yourmechanic.com)
My friend, who was an auto tech, says the whine is from low transmission fluid. (mechanics.stackexchange.com)