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<blockquote data-quote="Ditchplains1" data-source="post: 1195651" data-attributes="member: 12347"><p>Update...</p><p> Took it to my local repair shop, put it up on a lift. Nothing! Rotors not scored, U-joints tight, No slop in drive line. No play in wheel bearings, no metal on metal sounds. No leaking fluids. Drove it with mechanic and could not tell where the whine was coming from. Postulated it was possible wind whistle...but the initial whine became very loud as I slowed down. At present it continues to come an go, but only between 40 to 55 mph. Very high pitch; and easy to miss if not listening for it. No vibrations. Truck tracks like on rails. Normal MPG's. While driving with mechanic and whine was present, put it in neutral and allowed revs to drop to 1000 with no change; none with revving engine. One change today was that it now comes on with going downhill as well as uphill, and remains for a longer period of time...15-30 seconds then disappears. Disappears with any acceleration; but with steady pedal pressure will now last 15-30 seconds.</p><p> ATF level , Oil, PS fluid all good. Transmission temp 197.</p><p> I don't think it is the engine fan as the temps were in the 50's and luckily my truck tends to run cool. The fan rarely engages, and it was foggy and later raining when the whine initiated. The last time my fan kicked on was while hooning in the sand a year ago; never kicked on towing a boxy 2,000 pound trailer in over 4,000 miles.... and yesterday I was following a trailer for 20 or more miles at about 50-55 mph, 5-6 car lengths behind, up a gradual incline on smooth road in foggy 50 degree weather.</p><p> Most recent mod was the 27 fuse change to slot 70 with upgraded 20 amp fuse.</p><p> The guys at the shop are not sure either; it'll have to worsen before they can find the source....And DD IV next week!</p><p>Thanks for all of your thoughts....</p><p>Eddie</p></blockquote><p></p>
[QUOTE="Ditchplains1, post: 1195651, member: 12347"] Update... Took it to my local repair shop, put it up on a lift. Nothing! Rotors not scored, U-joints tight, No slop in drive line. No play in wheel bearings, no metal on metal sounds. No leaking fluids. Drove it with mechanic and could not tell where the whine was coming from. Postulated it was possible wind whistle...but the initial whine became very loud as I slowed down. At present it continues to come an go, but only between 40 to 55 mph. Very high pitch; and easy to miss if not listening for it. No vibrations. Truck tracks like on rails. Normal MPG's. While driving with mechanic and whine was present, put it in neutral and allowed revs to drop to 1000 with no change; none with revving engine. One change today was that it now comes on with going downhill as well as uphill, and remains for a longer period of time...15-30 seconds then disappears. Disappears with any acceleration; but with steady pedal pressure will now last 15-30 seconds. ATF level , Oil, PS fluid all good. Transmission temp 197. I don't think it is the engine fan as the temps were in the 50's and luckily my truck tends to run cool. The fan rarely engages, and it was foggy and later raining when the whine initiated. The last time my fan kicked on was while hooning in the sand a year ago; never kicked on towing a boxy 2,000 pound trailer in over 4,000 miles.... and yesterday I was following a trailer for 20 or more miles at about 50-55 mph, 5-6 car lengths behind, up a gradual incline on smooth road in foggy 50 degree weather. Most recent mod was the 27 fuse change to slot 70 with upgraded 20 amp fuse. The guys at the shop are not sure either; it'll have to worsen before they can find the source....And DD IV next week! Thanks for all of your thoughts.... Eddie [/QUOTE]
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