I saw the threadhalf thickness etc, but did not have time to play with them.
I see I made an error, suspension for wheel 6 and 7 is not hooked up to the spline… that also causes the track not to follow the wheel there, and also go through the floor.
Fixed it.
I changed the physx material on the floor yes 
… that’s not a bug… I like the dust. When I have time I will create a test map.
I plan to use Worldbuilder for that… now is a good time to test that workflow.
Next is to replace the thread with my thread… and I think I will continue detailing the model now.
I found torque curves for the engine.
CV90 has a Scania DSI 14 or 16 V8.
I implemented the 720Hp version and increased the weight of the hull to 24 ton.
Btw, the Weight value (for the hull) is that for the complete vehicle? I assume that is only for the lower section (hull, wheels etc) and that the weight of the turret is seperate.
The handling is much better with the new Torque curve and weight.