There's a bunch of threads on this subject so a search will keep you busy . Haven't heard of any problems with the cornhead grease thing . Ford called for 4 oz of " cylinder oil - soda soap grease " in the u-joint cavity . This stuff is thick but liquid . Closest thing I have found is " 00 " viscosity liquid gear grease . The exception to this is S.A.E. 140 is to be used in all needle bearing type u-joints . This is ford info . I personally use S.A.E. 140 in steering , ****** , u-joint & rear end . The key to using S.A.E. 140 is your driveshaft seal , speedo cap gasket , the two gaskets on the u-joint housings & to a lesser degree the cork-felt in the cap . The cork-felt is really just a sweeper - not a seal . There are many opinions on this subject & most seem to get the job done . Your call .