I had to take my 4x4 in for the rear end. They said that I needed new spider gears. What are spider gears? This is a 1992, with oversized tires.

 

The spider gears are the gears that are coming off each axle to the LSD/Ring and Pinion. Not normal to break both

here are some pics for other vehicles, they all look about the same on all vehicles though. Here is a link so you know more

http://wwwrsphysse.anu.edu.au/~amh11...volvo_dana.htm

 

Thanks for all that info! It helps a lot!