In my 2012 GMC 5.3 Z71 when slowing down to turn into somewhere without applying brakes when I roll down to 10 to 12 MPH I can hear and feel this growl. Could it be torque converter or something? The pitch/loudness of the noise seems to be dependant upon the speed of the gear. Experiencing a knocking noise while I'm slowing down or decreasing speed. Last night on my way to work, there was a quite prominent whining sound whenever I would slow down while in gear (5th was the worst, just about only happened in this gear). Its almost like when it shifts down into first gear it starts a light growl. Does not make no squeaking sound like a ball joint would. If the clutch isn't doing it's job in separating the transmission from the motor, then you will have a grinding noise when you try to slow the engine down with the gears of the transmission (engine brake). If accelerating and the howl is accompanied by a rumble or whir, it could be from a worn gear set or worn pinion or ring gear ⦠Your transmission is necessary in order for your car to operate correctly, and if you start to hear it make a clunking noise, you have good reason to become concerned. "Syncronizers" usually means grinding, difficulty shifting, or popping out of gear. The coast side is the side of the tooth on the ring gear that is contacted by the pinion gear when the vehicle is slowing down. I have examined the CV axles, tie rods, upper and lower ball joints and everything seems to be in place. The first issue is when Im driving the truck, when Im slowing down to stop, something in the drivetrain clunks when Im slowing down to 20 -15mph. It only makes noise when under load, acceleration, etc. Also, if I was accelerating and shifted past 3,500 RPM, give or take, it would briefly make the ⦠Low rpm issue could be clutch chatter. If the noise is coming from the gear box or front diff the could be wear on either of both of them. Common Issues When Transmission Makes Clunking Noise. 0 1. The same noise when accelerating could be due to overloading or low lubricant levels. Ja. Slow or hanging shifts ... Hi I seem to have a humming noise coming form automatic gearbox fluid levels are fine and is isnât tire noise and it also hums in neutral down hill what could it be. "Gears" could make constant noise when operating in that gear - and 4th gear is usually a straight lockup of the main shaft (by design). The front end is mostly all new, all ujoints are new so it cant be those. One common trigger for major auto repairs is transmission problems. Anonymous. A howl when slowing down but not braking is a bad pinion bearing symptom. Although a high contact-ratio spur gear set benefits from a contact ratio of greater than 2.0, it is also thought that a gear set with any contact ratio above 1.8 is beneficial in reducing gear noise. Pattern This is how you know if you have the gears set up correctly. And no noises when turning left or right. It doesn't happen if I just rev the motor at a stop, so I know it isn't from the engine. "slow down, or low rpm in 4th gear" is hard to diagnose over a computer. A quiet gear set is the result of a high contact-ratio spur or helical design, is isotropic superfinished, and has a high quality level. It sounds like it occurs right when the transmission downshifts to 1st gear. The noise sounds like the whine of a supercharger on a car or the sound of a manual trannied car that is backing up.
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