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Go buy the best synthetic grease you can find for it. Then before you do anything, crawl under your truck and count how many grease fittings you have on the front drive shaft, should have 3 plus a plug.
By the way, what year is your truck?
sorry toi drop the level of thread, maybe just because i saw Bruno the movie yesterday, but jeesshhh!! I had a 96 disco one myself. solid car, better than my disco II. didn't have to change u-joints.