As Gary pointed out, this topic has caused several very heated, and unbeneficial "holy wars" in the last several months on the TDR forums. You will get replies on both sides of this issue. I personally have been running various Amsoil 100% synthetic products in every appropriate part of my truck for at least the last 10K miles with no problems to date. The one caution I might mention, and even this has been debated before, is to put at least 10 - 15K miles on the truck before switching from dino to any synthetic brand of lubricants, to allow all the gears, etc. to wear in properly.
I am an Amsoil Preferred Customer, not a dealer or Direct Jobber. I do not sell their products, I only purchase them for my own personal use in my truck. There are several TDR members who are dealers, and any of them would likely be more than happy to supply you with all the information you might be interested in, if you would like to purchase some Amsoil brand products. I have seen other synthetic lubricant brand products at my local Napa (Redline).
Tom