2007 Sequoia 2WD :attention:
I have been told by the dealer that the Sequoia's transmission and differential are supposed to use World Standard WS ATF only. Currently I am using T-IV in the transmission and 80W90 gear oil in the differential. I am starting to hear a whining noise coming from the differential. The dealer also told me that WS in the transmission is usually good for 100k miles before changing (and that I should not have changed it at 30k & 60k ). Has anyone had any similar experiences with not using WS in their differential or transmission? Any idea how bad this screws things up? :confused:

The A750E transmission calls for WS toyota fluid, which is a low viscosity synthetic. Until recently, there were no substitutes for this oil. I know Amsoil makes one but not sure about other brands. If the fluid in your tranny is not a direct replacement for the WS fluid, change it now. A higher viscosity fluid may cause the tranny to malfunction.

Your diff fluid might be a little light. It calls for GL-5, so make sure that your oil is rated GL-5.
I run 75-90 in my front and center diffs, and 75-140 in the rear diff. The rear diff also requires synthetic.