There is a noticeably loud whinning when accelerating starting from about 30mph through 70-80mph. The coise stops when you let off the accelerator. It is hard to tell but sounds like it is comming from the rear axle.
Sound like transmission oil pump noise if you hear noise when vechicle accelerating moving.
SOURCE: 1999 Mercury Grand Marquis
Check the U joints.Check the gear oil in the rear axle.Check the exhaust,make sure not rattling or rubbing anything.
SOURCE: 2002 merc cougar 2.5 liter has loud whistling
Sounds like a vacuume leak, use some carb cleaner in a spray can and gently spray the engine. When you find the leak the engine will stumble, check in that area for the leak.
SOURCE: moaning noise coming from rear axle at 65mph+ very
Sounds to me like the differential. Check and add fluid, the driveline t's off at the rear axle, and there is a nut that your socket wrench should fit into (without a socket). Stick your finger in there and the fluid level should be to hole level.
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