I have been looking here for answers for a long time. This one has me stumped. I have a 2001 trx350tm (2wd manual) I have almost everything I need to convert it (is axles hubs different driveshaft) it appears there is a shaft b and thrust washer that needs to be added inside the front case cover. The cover has a molded boss with a welsh plug (freeze plug) in it where the shafts comes out. Looking at new parts catalog 2wd and 4wd take the same part number. Can I remove this plug and install a seal in the present cover?