No power when towing
 

I have a 95 f350 7.3 4x4 crew cab with long bed. It has 216k on the od. It pulls and drives great empty but I hooked to a 26' gooseneck and pulled good till we loaded a shipping container on it that weighed 4608lbs. I couldn't get over 60 mph and was starting to warm up. I live near Houston tx so was pulling on a slight upgrade butt Nothing major. Any ideas on what to check? Air cleaner is new. I make no smoke out of the exhaust and the blow by from the valve cover is almost non existent. I need to fill the container and move to Wyoming in August so any help would be great. I did order a 6 pos tp chip for it but am afraid of the high temps it may cause. Thanks

I guess I'm not going to get any help here. Thanks guys

I would get a set of gauges first to monitor vitals of truck. Is it automatic? If so is it shifting properly?

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Also if you had gauges you could tell if you had boost leaks or not.

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Yea I def need some gauges. It is an automatic and is shifting fine as far as I can tell. Truck has 4.10 rears I have been told. Without a trailer it is a strong running truck and shifts through all the gears normally with no slippage and doesn't get hot at all.

does it smoke under the hard pull

Maybe in need of a egr clean possibly