I don't think the angle gear is bad, I think I can rule the gear out based on traction from both front wheels. I'm looking for other possible reasons why the rear tires will not engage.

The car has 145k on it now.

I've read a million post on AWD problems and most of them lead to the bevel/angle gear or the coupling between the transmission and the gear. My question is, if the bevel gear or the coupling were bad then I should be hearing a noise and if I'm correct about how the gear works then I should only hav...