Originally Posted by Toby
So it only does it decelerating from 50-40? is there a specific gear it does it in or any time any gear from 50-40 mph?
Btw yes we used ford friction modifier along with royal purple 75-90 gear oil in all of our gear installs.
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It only does it from 50-40. When I let off the gas between that speed, it will start whining. Its weird because im pretty sure its in last gear. But it doesnt whine when slowing down from 60-50 or etc.