Another one for Stu @ LSx4U
 

I needed an adapter to mate my 4l80e to an NP208 T-case. I called Stu to see if they had anything, and sure enough they did, at half the cost of anything else I had found.
I was under the impression that a TH400 adapter was the same; however, they are not. Stu sent me an email explaining why and even attached pictures for visual reference.
Awesome customer service, highly recommend!