I got FRPP 3.73s installed a few weeks back. At first, there was NO noise at all from the install.
But within the last week, I have noticed the whine coming, with today being the most noticeable.
It typically occurs during decel around 45 and slower, after cruising at above 45. If i decel in gear mostly. Then it will continue until i accelerate again. Does not do it at cruising speed above 60, etc.
I am not familiar at all with the intricasies of gear installs, backlash, etc.
I had the gears installed with royal purple and 2 bottles of friction modifier. I assume they used the friction modifier... but dont know for sure.
As I said, at first they made zero noise.
Any ideas of why?
2009 Colorado Red Mustang GT
FRPP Stingers, FRPP 85mm CAI, FRPP 3.73s, FRPP K-Springs, FRPP/GT500 upper strut mounts, Shelby Adjustable Panhard Bar, Tokico Str.t, Shelby CS40, GT/CS Front and Rear Bumpers, GT500 Spoiler, Jegs O/R H, fuzzy dice.