Just wanted to chime in and see if people that are nicer to their engines are enjoying the same issues. Have any of you guys experienced decreased performance? My work mobile has just under 74k on it now and it seems to have lost a lot. I was towing a different work trailer the other day in a more normal environment. Not the typical 9k trailer up the canyon, which by the way if the ambient temp is above 70 my truck will overheat and go into limp mode within 3 miles of starting up the canyon.
Yesterday I was towing a different trailer, much smaller profile I would estimate between 4-5k. My truck is equipped with the 3:73 gear ratio and it wouldn't even hold 6th gear on I15 going over the gentle overpass grades. It also will no longer hold 6th gear going up parleys with no trailer, sometimes dropping to 4th at 70mph. It used to cruise up without issue in 6th.
Now I don't know what maintenance has actually been done. I've had check engine for numerous things, and the thing runs like crap on initial start up. I've asked for the spark plugs to be changed several times, but not sure if they ever have. The throttle body has had to be replaced, went on a tow truck for that one, muffler had to be replaced, and a broken exhaust manifold stud. All three of those have had to been done on almost all of our trucks, fuel pump is another ticking time bomb that a lot of my co-workers have had, mine hasn't yet.