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My fifth gear was making a harmonic noise or something when i was in low to mid rpm range. i bought a used tranny with half the miles that my truck had and now it does it just about the same, but it is a little better. it makes the noise when i shift into it between 52 and 57 mph, then it goes away. could i need my drive shaft balanced. ujoints and carrier bearing looked great. any ideas would be greatly appr. thanks matt