I added a full bottle of Friction Modifier to the 06 Stang's rear two weeks ago and. WA-LA................... Axle moan is gone......................Looks like that's exactly what Ford left out of the rear gear lube................. Someone undoubtably thought it would save money, but ended up causing a problem instead.
Is it a moan when cornering at low speeds? Or a whine at highway speeds? Moan in cornering is the Traction Loc clutches slipping, letting the inside axle turn at a different speed than the outside axle.It sounds like two objects rubbing against each other. A whine at highway speeds would be gear related (ring and pinion)
friction modifier will not help gear whine. the whine is from improperly set up gears.
You can hear some whine as it's accellerating. I know mine does if I pay attention to it. 12,000 miles and no gear problem.
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