I'm not sure what the master cylinder came out of. I picked this jeep up Friday from a guy that didn't know anything about it. It has a chevy 350 motor with a TH350 trans, a dana 300 transfercase with a 44 in the rear. I have no idea what any of it is from. I did pull the drum back off last night and it appeared to have gummed grease on the drum. I cleaned it off and they worked fine. It sat for five years in this guys garage so it appeared to have leaked into the adjuster hole. Thanks for your ideas.