I agre with CP...I've installed Strange, Motive, Precision, Yukon, Richmond, and one old set of Zoom...lol. 8 3/4, Dana 60, Dana 44, 8 1/4, GM 12 bolt, GM 10 bolt, Ford 8.8 and 9"... Set up properly, they will not whine. Regardless of ratio, or manufacturer. I have seen one bad set of gears. From Precision, and they were 3.00 ratio for a 9". (I rebuilt a ton of rears working at a 4wd shop...lol) They were just barely audible in a perfectly restored '71 Mustang. The guy would drive with no radio, and the windows up just to try to hear noises. It took 2 sets and more than 3 times in and out of the car to get a set he was happy with. I wonder if the gears were really bad, or his ears were really that good. My boss had to ride with the guy with him driving, to get it to make the noise. It's also imperative that the proper break in procedures are followed. 15 minutes on the jacks at steady cruie of around 40mph. Then, park it until it's totally cool. Then, 2-5 mile drive, with very light throttle and coast...then park and let it cool down. Then if it's all set, I drive about 10 miles or so, going med to light throttle and coast. After that, beat the tar out of it