I tried to find a model number on it but there's nothing cast into the housing anywhere I could find. I'll see if I can get some pictures of it to help with identifying it. The gear I need is a 4 1/2 inch diameter helical gear with 72 teeth. It is driven my the crank gear and drives the fan shaft.
I don't think it's a 400 - weren't those numbers cast into the casing? Like I said, I'll try to get some photos. Thanks for any help.
Dan