Weird that as per the TSB, Toyota's most recent recommendation is to use MP grease on all joints except for the double cardan which is moly. Isn't a double cardan joint just two U-joints? How is it different in construction vs a U-joint to require (in theory) a different grease?
It seems the reason why Toyota initially specified two greases is because of the presence of sliding vs rolling forces. Rolling forces are better serviced by a (NLGI GC rated) MP grease and sliding forces by a (NLGI LB rated) moly grease. However, these days greases have become so good that most moly and MP greases are both GC and LB rated, so it might not really matter. All the old school guys saying moly greases ruined their U-joints were probably basing their experiences on ancient greases which did not perform the same in these two applications as compared to a modern grease.
I'm curious why Toyota would switch from a moly to a MP grease for the slip yoke when sliding forces are better serviced by a moly grease.