I have a 96 Montego that I just bought. It came with the owners manual and that says there is a plug at the front (top) and back (bottom) of the driveshaft housing. It is filled with oil, not grease. Says to drain and replace once a year. I found the lube on ebay. $12/bottle. I plan to do a search here and see if there is a substitute oil that can be used. Hope this helps, I'm new to this hobby too.