2008 Nissan Titian rear differential noise. I have this loud roar noise when decelerating. I’ve checked wheel bearing they are good . Could it be rear differential? if so what?
RESPONSE
This is a classic description of a failing rear differential pinion shaft bearings(#5 and #9 in image). You give it gas and the noise dissipates until you let off the gas.
Rear Differential Noise
Remove or disconnect the following:
- Rear wheel and tire assembly
- Wheel speed sensor
- Brake drum or rotor
- Brake shoes or caliper assembly
- Parking brake cable
- Brake fluid line
- Bearing cage and backing plate bolts
- Axle shaft assembly
- Axle seal
- Wheel speed sensor rotor, if equipped
- Lock-washer
- Bearing lock-nut
- Flat washer
- Wheel bearing
- Wheel bearing cage grease seal
Car differential gear
Some sure signs to look for would be metal in the oil. Remove the fill plug on the rear end and take a sample. You may remove the entire rear end cover to inspect further. Look for shinny metal chips in the fluid. May be very fine in size.