Yet another failure

polskifacet · July 12, 2019, 10:33:46 AM

Hey guys,
Next on the fail list: Rear Diff. Bearings are shot, weird because I actually serviced it so it isn't the factory fill. 2k left on CPO warranty so fingers crossed dealer fix.

Csbbrah · July 12, 2019, 11:20:45 AM

Did you have any warning signs for it going out?

Sent from my LM-Q610(FGN) using Tapatalk

SHOdded · July 12, 2019, 11:29:42 AM

RDU bearings? Where are those located?

polskifacet · July 12, 2019, 02:17:27 PM

Quote from: Csbbrah on July 12, 2019, 11:20:45 AM
Did you have any warning signs for it going out?

Sent from my LM-Q610(FGN) using Tapatalk

Still works but whine at 40 mph. Taking off the rear seat made it much more obvious.

polskifacet · July 12, 2019, 02:22:49 PM

Quote from: SHOdded on July 12, 2019, 11:29:42 AM
RDU bearings? Where are those located?

Diff bearings usually tapered roller bearings on the pinion and gearset

polskifacet · July 12, 2019, 04:49:12 PM

Also adding rear sunshade gears ate each other another $100. I'm doing the retract when you put into reverse delete as even when its down it tries to retract causing the gear teeth to sheer off.

shoNoff · July 12, 2019, 07:38:05 PM

I'm getting a low hum at 40ish. I'm really hoping it's not the diff.

SHOdded · July 13, 2019, 12:01:25 AM

If it makes no difference turning left/right, it is worth checking the PTU/RDU fluids.

shoNoff · July 13, 2019, 09:32:19 AM

Quote from: SHOdded on July 13, 2019, 12:01:25 AM
If it makes no difference turning left/right, it is worth checking the PTU/RDU fluids.

If you were asking me. No it's the same sound while turning. I was messing with that last night. I was trying to convince myself it was the tires. But it's not. I was hoping wheel bearing but with it staying the same turning I doubt it. Guess I'll have to crawl under there and check fluids. Both were changing around 13k ago.

SHOdded · July 13, 2019, 12:39:38 PM

Send samples off to Blackstone if you get a chance.

polskifacet · July 16, 2019, 09:15:22 AM

Take off the rear seat cushion and it should get much louder if it is the diff. Wheel bearings will change they way they grind if you do a turn at about 20 mph try both left turns and right turns.

If you look at my PTU thread, the gear shafts are tore up, crappy manufacturing. The gear shaft isn't hardned uniformly and the shaft got pitted.

shoNoff · July 16, 2019, 09:18:56 AM

Left and right make no difference. The weird part is no one can hear it but me lol. I did only start to notice after swapping my mounts. I'm going to pull the seat pad tonight on the ride home and see what I hear.

802SHO · July 16, 2019, 09:48:09 AM

Fingers crossed its just the mounts and you're paranoid

SM105K · July 16, 2019, 10:27:08 AM

Quote from: 802SHO on July 16, 2019, 09:48:09 AM
Fingers crossed its just the mounts and you're paranoid

For the first 200 miles with the new mounts I was on extreme edge. My car never made the sounds, vibrations, or direct driver inputs until I put the mounts in.

That being said, I love the DAMN things. The shifts are amazing, the driver inputs are magnified, and the sound! Inside the cabin the car actually sounds like it has an exhaust now. The pitch and feeling of the motor has completely changed for the better for me. Now other people may absolutely hate it, but not I.

802SHO · July 16, 2019, 10:33:59 AM

Quote from: SM105K on July 16, 2019, 10:27:08 AM
Quote from: 802SHO on July 16, 2019, 09:48:09 AM
Fingers crossed its just the mounts and you're paranoid

For the first 200 miles with the new mounts I was on extreme edge. My car never made the sounds, vibrations, or direct driver inputs until I put the mounts in.

That being said, I love the DAMN things. The shifts are amazing, the driver inputs are magnified, and the sound! Inside the cabin the car actually sounds like it has an exhaust now. The pitch and feeling of the motor has completely changed for the better for me. Now other people may absolutely hate it, but not I.

I concur, I love them too! Could never live without now. Tim said he started hearing a sound after the mounts so I hope it's just associated with the mounts and not his PTU or Rear Dif. Another thing to try maybe would be to put the stock mounts back in and see if the noise goes away.