I'm going to be freshening up my 904 and also swapping the 4 disk drum to an A999 5 disk setup with associated parts.

Right now I have a narrow red lined flex band (I think with a 4.2 lever) and it seemed to work fine but I am going to be putting some more power thru it this upcoming year and don't know if I should upgrade to a solid or other friction material.

I know with the 5 disk drum, I could now use a wider A999 band but I was told to not use it since the lugs are offset and it causes the band to not apply straight.

Any thoughts??