Greetings I have a Autozam van, 97 I think, automatic transmission, rear mount engine. The other day I was crossing a drainage ditch, and the right rear wheel became suspended over the ditch. It just sat there. The left rear wheel did not engage. I had to push it so the right wheel was on solid ground. I thought if one wheel slipped, power was transfered to the other wheel unless you have positive traction or positraction in which case both wheels receive power at the same time. Is something wrong with my transmission, or drive shaft's or is this normal for only one wheel receives power?