How did you rough the surface up? that area of the trans is usually smooth.You can clean that aluminum with every cleaner in the world, but if the material your trying to bond it to is not etched properly it wont hold. And on another note I have noticed with jb weld on a aluminum surface that is in a high heat enviroment the two materials expand and retract at different rates which results in the jb bandaid seperating or cracking. My advice to you is peel it back off and fab a plug in it, chances are you will be doing it later. I only use that stuff for extreme last case problems! IMO