Is there a way to tell the difference between the standard 4R100 and the HD model without opening it up? The reason I asked is I just got my HD4R100 from Tousley and I want to make sure I got the right tranny. Mike told me they do not ship them but put in the order an then they come from a distributor. I just want to verify that I got what I paid for. Are there any identifing marks on the exterior or some other means to confirm I received the HD model?