I've used Mystic HighTemp/Extreme Pressure quite a few years, with pretty good results. I prefer a good HT/EP Moly or lithium. I now use this:
http://www.royalmfg.com/product bul...DS ROYAL 876 HD EP LITHIUM COMPLEX GREASE.pdf So far, I've had excellent results, but time is the true test. In the past, the absolute best I've ever used is Texas Refinery Corp, 880 Crown and Chassis, but cost became prohibitive in using it. I only suggested the Mystic, as it's readily availble over a broad area. Valvoline also makes a Moly EP grease I've used because of circumstances a few years ago, and it's still running in one of my trailers... . it's proven to be good, and many places, including Oriely's sells it. I'm not sure, but I believe it's Valvoline EP Moly Fortified, and is available in a 14oz gun tube or a 4lb tub. It's lasted 7 years, probably 50k miles, and counting on my 16ft utility, which I have a tendency to overload frequently... ...
Also, if you use your trucks hard, and foard water crossings, mud a lot, and just abuse the snot out of it, I'd suggest looking for something that is water resistant. Regardless, you're going to be happy with the free spin kit, and if you use a good quality HT/EP grease, they'll last a long time. I've got several Dynatrac kits around, and then old Dodges with locking hubs. I've gotten well over 100k on most of them on the original packings, and the TRC grease hasn't even turned color. That's the sign of a quality grease!! The Mystic grease has gotten quite a bit darker of the years, but still holds it's tackiness. I've only got 40-50k on the Royal 876, but so far it's still the same color. The Mystic is not nearly as water resistant as the Royal or TRC. I've repacked a few of my mud monsters because of water infiltration..... but I deserved that!!
