Hello, thanks for letting me join! I'm new to the modern Mustang scene and just bought a 2008 V6 auto which is pretty much stock except for the PO must have changed the rear end to a posi and possible lower gear ratio. So I'm having this nasty howling/moaning at all speeds but worst over 40mph. Bearings and brakes check out ok. I think the tranny is fine but I can't tell if it's the rear end or the tail of the tranny making all the noise. Also the tranny shifts thru all 5 gears before 40mph. Seems like the speedo is 5-10mph over what it should be. So if it is the rear will the Ford friction modifier help clear up the howling? Also, is their a way to tune the shift points so it shifts later? I did the half ass drain the tranny of 3 quarts and dilute it a little with new Merc 5, the fluid is dark but clean, she has 56k on her. Driveshaft is still original 2 piece but seems to be solid no flex. Help any suggestions for getting rid of this moaning is much appreciated!