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I have an f40 trans from an 07 g6 GT as well as a 2006 monte carlo lz9 3900 and will be doing a swap over this winter I will update with details as it goes along

Join the club......15Khz?,,,,,,,you're concerned about frequencies ABOVE that? Normal frequency hearing range due to a non traumatic loss for the average male above 50 is approx a 10khz ceiling, a loss of all above that is considered normal, if you can still hear a 15khz sine wave you're doing good, only adolescent kids can hear as high as 16khz. I too have tinnitus in both ears, 1st the left ear 12 years ago, then the right ear developed the issue 5 years ago. The hearing aids reduce the *ringing* in the ears, & they returned my ability to hear frequencies up to 10khz. My audiogram show my hearing drops off starting at 4khz in both ears & the loss severely plummets at 6khz. If you haven't done so get your hearing tested & if need be get hearing aids, they WILL help with the tinnitus.