I owe you all a big thanks. You saved me a ton of money, and reassured me to boot. After a session at the car wash this morning (I pulled the shroud and there was enough trash between the radiators that you could have built an eagle's nest!) and a full day of stop and go running around in 100+ heat, the tranny was solid at 165, and the engine at 205. The fan clutch was kicking on and off, because I could feel the difference in the AC in both force and coolness.
So...I'll hang out on the forums for a while and see what else I can learn from y'all. Thanks again!
2005 GMC Sierra 2500HD Ext. Cab 4x4 6.0
1998 Jayco Designer 29RKS