At least on the 1st gens, you use moly grease in the upper/lower IFS ball joints. There's no zerk. Rather it's a hex bolt you remove. You shouldn't pump it 100% full of grease (or that might cause leaking). I just feel the rubber boot to ensure there's sufficient grease in there. I did replace the hex bolts w/ 90 deg angle zerks for ease of lubing, but am careful only to lube 2-3 pumps.
I originally used Valvoline moly for both driveshafts and wheel bearings. Now that I have two Lincoln grease guns, I use Amsoil red (MP) for the rear driveshaft and U-joints and wheel bearings, Amsoil purple (moly) for the front driveshaft double cardan, ball joints, and rear shackles (OME shackles). Those driveshafts are tougher than you think. You can easily go 30+K mi if you don't drive through water.
I didn't know the slip joints on 4th gens use moly. Personally, I think if you use moly everywhere (I used it in the wheel bearings w/ no issues), you're probably OK.