This info may help; the Toyota RAV4, Matrix and the Vibe use the same type of drive couple. There are a lot of different types of viscous couplings, even a torque convertor in a automatic transmission is a type of viscous couple. Anyways check these links for more info on the type that is used in t...

Thanks for the link to the article, but it seems to have overlooked/omitted a basic point of VC operation - it only takes a speed difference of about 8% for the plates to start slipping, and once they do, it takes about 1/10th of a second for the fluid to heat up and expand enough to "lock"...

Good Morning: As the title says, I've got a question regarding the 2009 AWD system, but please allow me a moment of venting about the overall frustration of this situation. I'm an entry level, professional mechanic. Although still inexperienced with many things regarding drive train systems, the bas...