In the specifications section in my Haynes manual says:
Friction plate thickness: 3.0 mm (0.118")
wear limit: 2.7 mm (0.106")
warp limit: .05 mm (0.002")
But then in the chapter it gives the specs of:
3.5 mm and 3.1 mm
The service manual says:
Friction plate thickness: 3.0 mm (0.118")
wear limit: 2.7 mm (0.106")
warp limit: .05 mm (0.002")
So the Spec's section in the front of the Haynes manual and the service manual are the same so I'd go with that.