Picture didn't come out too great but this is a snapshot of my 99 gas Suburban pulling our 165BH up a 6mile long 6% grade today. Both water and transmission temps were in the 190's. 45%
load in 3rd gear. Engine wasn't even straining to maintain 55mph. Not to bad for 253k miles. First time towing in the mountains with It. She kind of impressed me. Theirs still some life left in that 5.7L.