Bill,
Can not say how good it is But I bought a ATI aluminum pump for my deal. Had lots of good comments on their piece. Also lucked into a Coan max duty aluminum planetary with 1.69 I wanted. As for aluminum drum I wanted to do it also,cash not here. Also had mixed opions from quite a few. Greg at FTI did say it would work along as you use correct band with it. It is a big drop in rotating mass. Also Parks sales lots of lite wieght parts for glide,which you probably already know. I know he sales reverse pressure plate and aluminum high gear plates.