my dad's w140 S280 tranny has just gotten out of the tranny shop.
The planetary gear assembly needed replacing as a bearing inside the assembly disintegrated, (lost reverse first... went home then this grinding sound started)... resulting in a tranny rebuild... plus a new planetary gear set.
Anyway... everything seems to be running smoothly in all gears... except there's this whine when you let off the throttle... once you apply just a tad of throttle the whine disappears... what could be the problem? will be returning the car tomorrow... just wanted the board's advice as i find people here are much more knowledgeable than most shops here in the Philippines.

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project