I got my gears done about 2 weeks ago and have noticed ever since I picked up my truck that the gears are whining. It is ussually at times when I have my foot on the gas at around 35-55MPH. Sometimes it is a low sound and other times it gets pretty loud. Sometimes there is no noticable sound at all. I understood that I might have to deal with some extra noise from the rear but not this much. I had 4.56's put in my stock f-150(4.6L) 8.8. What do you guys think?