Just started this, after pulling together lots of little bits of information from the internet and youtube. Decided to post it here in one place in case it helps someone else.
Our 2011 Sienna XLE AWD started making a loud bearing grinding noise from the rear end. It was equally loud on each side, so I am convinced its the Diff and not a wheel bearing. The vehicle has about 90,000 miles.
First, this Sienna has a "electro mechanical coupling" between the driveshaft and the rear differential. It is similar, but not identical to a problem with Rav4 that have a "viscous coupling" in the same location. Ours has a vacuum connection and an electrical connection. The Rav4 coupler has no wires. The service bulletin for the Rav4 is available online (Toyota Technical Service Bulletin T-SB-0080-13 or TSB008013). I will try to post it to this thread. Remember, its a little different, but it is very valuable - it gives all the torque specs, lists some inspection criteria, and the correct orange sealant to use (FIPG Sealant: Three Bond 1281, or Equivalent - Toyota Part # 00295-01281).
Our 2011 Sienna XLE AWD started making a loud bearing grinding noise from the rear end. It was equally loud on each side, so I am convinced its the Diff and not a wheel bearing. The vehicle has about 90,000 miles.
First, this Sienna has a "electro mechanical coupling" between the driveshaft and the rear differential. It is similar, but not identical to a problem with Rav4 that have a "viscous coupling" in the same location. Ours has a vacuum connection and an electrical connection. The Rav4 coupler has no wires. The service bulletin for the Rav4 is available online (Toyota Technical Service Bulletin T-SB-0080-13 or TSB008013). I will try to post it to this thread. Remember, its a little different, but it is very valuable - it gives all the torque specs, lists some inspection criteria, and the correct orange sealant to use (FIPG Sealant: Three Bond 1281, or Equivalent - Toyota Part # 00295-01281).