Anthony,
I have not yet driven a David Kee aluminum top loader transmission, so I can't comment. I have driven quite a few of his iron transmissions and they are great.
I am going to build myself a new car shortly, and I will be using the new 5 speed Tremec 600 transmission in it. I really like the gear splits in the tranny and it weighs the same as an iron top loader. The aluminum top loader is about 20 pounds lighter.
David
