2
questions

When we purchased the van, the serpentine belt began coming off after hitting a large patch of water. Father-in-law, who was very mechanically savvy, said van had larger than normal alternator and needed a 955 belt instead of the recommended 945. Put on 955, ran great until a week ago, belt came off, was shredded and bits wrapped around fan post. New belt (955) flies off immediately, and fan area where belt sits (only non-grooved portion of belt system) is completely smooth. Friend suggesting removal of fan cover to see where issue may be - not sure how to do that, nor why belt may be flying off. Any help would be fantastic.

It a passenger truck with no reverse. It runs forward ok but I want to replace the transmission instead of rebuilding it. Thanks.