[BigSwede]

I have no idea about 147 GTA diff failures but it is a quite common problem on the other cars like 164, 155, 156 and 166. A friend of mine busted his diff just a couple of months ago on his 164 3.0 24v. The metal remains showed clear signs of fatigue.

Toe in in the rear gives better grip in steady stat but the car can feel a bit slow in reactions, toe out gives great initial turn in but removes grip. rear end grip is maybe not the 147 GTAs biggest problem, that heavy front end and the powerful engine is the perfect way to create understeer problems (very often forced by the driver I might add).