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97 E4OD strange sound diagnosis
Just bought a 97 F250 PSD, 2wd, 3.55 gear with an E4OD auto. Tranny shifts as new, fluid is very clean with no odors. All seems perfect with the exception of a faint grinding or roaring noise that is heard at cruising speed. I hear this noise any time the driveline is "loaded" - in other words starting up any kind of grade not matter how small the grade is there is this grinding noise that almost sounds like a rough bearing sort of. The noise isn't loud but is very distinct that's it not the engine I'm hearing. But, when going down a small grade and the driveline "unloads" it goes away. I can shift into neutral while it's making the noise and the noise goes away... I'm just positive it's coming from the area of the tranny. Doesn't sound like a rear end and clearly seems like it's not a u-joint but I can't pinpoint the issue.
FYI, my truck had a Jasper tranny installed by the previous owner almost 4 years ago but only 15,000 miles ago (replaced at 137k, now has 152k). Previous owner bought the truck new and never had any trouble at all until the tranny went out. Like I said, it shifts and performs fine now but this noise tells me something is wrong.
Could anybody help me diagnose it or give me tips if you've had similar sounds from your E4OD?