:Comp: Question: I briefly read about the type of TH-400 transmissions and their codes...for those of us who don't know if there's any significance in the transmission codes; BA,BB,BT;etc. What is the significance? is it true that one could find a TH-400 with a 2.75 1st Gear in motor homes,if so which motorhomes do I crawl under? It's a bit confusing,so this is the moment where the enlightenment should start to flow...? Thanks,Jay B.Britt,Jr.