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TP..... ...think about it. When you push down on yer clutch pedal, only the new THROWOUT bearing is moving and surprize NO noise. When yer in NEUTRAL and clutch out, yer tranny INPUT bearing and input GEAR is turning yer 1-piece counter-shaft. Sliding output gears are NOT turning. (why? 'cuz yer in neutral) When yer back-coasting, yer rearwheels are providing reverse pressure to yer tranny sliding gearshaft, gears and counter-shaft and NO whine. With the above logic, the ONLY gearset that rotates during ALL conditions of "whine" is yer COUNTER-SHAFT. Yer sliding gears and counter-shaft have "clearance" shims; p/n: 9N-7135-A,F,G, shim, tranny bearing retainer, 0.003, 0.005, 0.012, A/R. Surprizing enuff, tranny bearing pre-load is a function of turning resistance (20in-oz) not gear clearance. Not many mechanics have in-oz spring gauges. Me? Iff'n I can't slide the gears back'n'forth with a lever and have NO NOTICEABLE slop and can still hand-turn then I'm probably good. Iff'n I can't hand-turn, its TOO TIGHT. Simple, eh? My advice, depending upon degree of annoyance, unless yer poppin' outta gear, LEAVER BEE. Iff'n it really bothering you, I predict you'll haffa tranny rebuild in yer future. Its not rocket science. And ALWAYS replace the tranny input shaft seal. ($3, cheap) ..... ..Dell
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