I don't think so. I switched from a TH 350 to a TH 400, (best decision I ever made with that truck), a lil over 10 years ago & have collected about 15 of these cover pans & not one of them fits. So I just don't worry about it. I've never had a freezing up issue with the starter or anything else, so I don't even think about it till I'm laying under the truck for some other reason & notice it. But by the time I get out from under it, I've forgotten all about it.
I don't know if an 8" lift has anything to do with it or not.......