The transmission is aluminium.
I painted the oil pan aluminium out of habbit since it came chrome from the kit. I have 2 problems, one is that this aluminium paint doesnt come off in dot3, and second is I like the way it looks. The aluminium oil pan and the chrome fan kinda go good together.
The interior pieces Im going to leave alone because not only are the pieces you mentioned glued in (the only ones too), but I dont have anything to touch up the Corvette emblem to make it look chrome.
/edit:
You wanna see how much I was going to keep that oilpan NOT stock?
When you pointed it out, it gave me a push to get r done.
Oh and heres a picture of the working suspension:
