Probably too late to point it out, but a 180 thermostat is too cool for an EFI truck. It won't get up to operating temp (192) which can really knock your fuel mileage numbers down.
Used to put a cooler stat in for warmer weather in the old days of carburetors, but with an ect sensor the computer figures it's not warmed up yet and dumps excess fuel to compensate for a cold motor.
I imagine it's already installed and it won't hurt anything I suppose, but if you find that your mileage drops off, that would most likely be the reason.

 

Thanks I never used to like the rims until I had them on it paid $400 and there at about 60%tread couldn't pass it up and I live in Florida it's always hot haven't noticed any change in truck other then temp being lower. I run 180 one on my jeep to help keep it cooler along with a few other things also here's a pic of my other rig. 97 Jeep Grand Cherokee 318ci 4.5" lift and 33s

 

nice jeep! just got rid of mine. had the 4.0 in it though. I wanted to build it up like that just lost interest due to it having a 4.0 I would of if it had the 5.2 or 5.9

 

Thanks only paid $100 for the jeep have about $1200 invested total damn good trail rig

 

Had the truck out near the beach today at a truck meet