Saab: Vibration during accelaration, accelaration, retaining ring

Question
I have a 92 900S manual trans. Recently I have noticed at highway speeds a vibration from what seems the front axle when I let off the gas the vibration stops and starts again upon accelaration. My guess it is the inner driver is going bad, and is it an expensive repair?

Answer
Jaime:
  Yes, you are correct...it is almost certainly the inner "tulip-cup" driver. It can be an expensive fix if you take it to a SAAB place or other expensive, but "unimaginative" shop. But the clever thing to do is simply exchange right and left hand drivers; you'll need to remove both half-axles and drive the tulip-cups out of the gearbox and re-install them on the opposite side. They are held in place by a ring bearing housing bolted onto the side of the gearbox. Once this housing is removed, the worn drive tulip cups can be removed from it by releasing an internal tru-arc retaining ring and driving them out.The ring housings should remain on the sides they came from along with the installed shims. Hope this helps,

                  Jerry