How many miles on the truck? Might just want to order a new pump from Clay at RiffRaff, new thermostat, T-stat housing and the 3 bolts and plan on a weekend project. Good reason to flush out the cooling system and put some new koolaide in the system too!! Preventative Maintenance!
I just received my new supplies from Clay and am going to be doing some PM on mine in a few weeks, with 145k it probably wont be long and I would rather do it in my driveway as opposed to trying to do it on the side of the road or worse having to have it towed and letting somebody else do it for 2 or 3X the cost of doing it myself.