Ah well i got it sorted by going back to the original max file. When i exported to 3ds texture names over 8 characters were cut. After reassigning the textures in gmax it came out with the shading. Probably my lack of knowledge with gmax. I'd still like to know a better way around this though.
Are you sure that all the model parts are the same colour when u delete the skin from ur model?
When not: open de renegade skin applyer, click get renegade material. When you see that the colours in the 4 boxes changes you've to set the 2 on the top to white and the 2 on the bottom to black.
I think that the part of the moddel in the middl got a darker color then the rest of the model.