Finally got it out for a 2-hour round-trip; mostly freeway drive. Max temp on the freeway was low 160'ish. City streets was low 170's. Not towing, ambient air temp 55 or so. Very good start!
Took longer than expected, but I finally got some time this weekend to get the swap done. Pretty simple to do, only two bolts. Didn't lose much fluid, maybe a couple tablespoons' worth. Now I've gotta actually drive the truck & see what my temps drop to, lol....
What's the door jamb sticker say for recommended inflation psi? Usually LT tires are higher than P-rated. If you step down to P-rated, might be an issue with the TPMS?
I use this stuff. Pound it on thick with a schutz gun - completely satisfied with its performance through the winter & doesn't hurt the frame wax from my experience. Not cheap, but neither was my truck.