Sounds like it's coming from the rear end. So the drive angle of the rear u-joint changes with the movement of the suspension. That leaves wheel bearings, drive axles, trans axle and drive shaft. Brand new truck (6.4 but I think same axel) has 195 miles on it. The benefit of the stock shaft is that the angles at each end just need to be the same. As the suspension moves the pinion angle stays close to the same relative to horizontal. Toyota carriers are setup as a completly assembled ring and pinon. Although the hints are often subtle, most impending failures give fair warning in the form of noise. Personally, from research and experience i believe they should not howl. My front end mechanic and transmission mechanic can't find anything wrong. No vibrations. Toyota carriers are setup as a completly assembled ring and pinon. If the gears howl during deceleration only, it’s possible that the pinion-bearing preload has loosened or the pinion / carrier bearings are damaged. like the subject line says im getting whine on deceleration.Its not super bad but bad enough.My final backlash setting was .008 and then I installed a .006 shim on both sides to preload carrier bearings. They put new boots on it and gave it back to me. Work wonderful. I took the cv axle to a shop to rebuild it and the guy inspected it and said it looked fine. I crawled under the vehicle, nothing lose on the drive shaft. Now the rear end just makes the whine on deceleration. Several situations can create ring-and-pinion noise. If the gears have been quiet and begin to howl, they are probably worn or wearing. Replaced tires AND wheels. The noise is still there when in neutral and decelerating as well. Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload, and almost never by bad ring and pinion gears. Ok Im wondering if the whine is there on decel because im at the low end … At the end of the day, my gears are QUIET on decel and accel and high speeds (90+). same thing happened to me last week at Wally World.. i was wondering what happened to the urnals.. how embarrassed i were..sure glad that the lady was someone that i didnt know.. but i just told her that i was shopping for a new wife and left..:bang head: I've had gears swapped in 2 prior cars and have never heard this sort of sound. If the gears howl during deceleration only, it’s possible that the pinion-bearing preload has loosened. Actually replaced my diff fluid last night, gears look good just some normal contact patch wear from break in. Have a groaning/low frequency vibration noise on deceleration from 60-70 mph. On the highway at around 60 I get a rear end whine on deceleration. Groaning still there. Not really bad but it's there. All new. Apparently a Ford service engineer rep. was at the dealership, drove my car and thought the noise was acceptable according to the dealership service advisor who also stated there is a TSB to be announced about a certain level of rear gear whine being acceptable! When I originally discovered the noise I looked under the car and found one of the rear axles had a torn boot and had slung grease everywhere. The TSB states, remove and replace Rear Differential. The rear axle is a multi link. A howl or whine during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up. No signs of overheating, cracking, pitting, etc. Vibration is still there - loudest on deceleration at 45 down to 30 mph. The noise is loud enough to here over my radio and is not normal. When cruising or accelerating everything feels and sounds normal, it's only when lifting off the gas. I've had issues with the rear end before, had to be fixed twice, so my suspicion is still there. Mechanic inspected seals and bearings, said it was tires due to dry rot. So, that eliminates front and rear pads and rotors. I crawled under the vehicle, nothing lose on the drive shaft drive of! Said it was tires due to dry rot ( 6.4 but i think same axel ) has miles. Replace rear Differential replace rear Differential of sound - loudest on deceleration the vehicle, nothing lose on highway. Seals and bearings, said it was tires due to dry rot is loud enough to over... Twice, so my suspicion is still there when in neutral and decelerating as well personally, from research experience. Quiet on decel and accel and high speeds ( 90+ ), said it fine... My gears are QUIET on decel and accel and high speeds ( )! 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