Hello the truck has pulled in the past and has a history of overheating. None of these are currently a problem.

The battery , hoses, radiator, spark plugs and wires have been replaced

I can drive this truck on a daily with no issues just the following quarks

when pushing it on the highway 70+ the ac stops working I can here the vacuum suck in.

when going up long hills I sometimes struggle to maintain speed.

when towing a small trailer 500-1000lb hills are 40mph max

before this problem was evident I planned on hauling horses so with a 7000lb trailer I made it a mile and a half down the road before I turned back - no power to pull.

I have had it to three mechanics who all know each other. The general consensus is that “ this old truck is not meant to haul this big trailer, you would be better off buying a new one”

When I questioned them “ the towing capacity is 12,000 pounds? “
I was corrected and told “that includes the weight of the truck so 12- 5 for the truck no wonder it won’t pull . “

please help I’m waiting on a tool to check back pressure of the exhaust system.

What’s next? Or is this truck truly not built to haul because it has a gas engine not the diesel?

 

It’s geared 4:10

 

Can you bring us up to date on what other work , if any, was done ?

High fuel demand, which takes place at high speed and load places a lot on the fuel supply. Were any kind of tests done to verify there is no fuel problem ?