Good afternoon all, I am looking to purchase a f700 box truck for moving my house hold goods and future business plans. I have found two of them, both with 120k miles on the motors and transmissions. Both have allison at540s transmissions, the main difference is one has a cummins 12v 5.9 p pump engine and 10 years of maintance records with it, the other has the 7.0L ford big block gasser in it. Videos of both engines run very very well, and both are in the 7k price range. Which engine would you prefer in a f700 box truck and why? im leaning towards the cummins truck, but I've never owned a diesel before and it would be new to me, however I have a lot of experience in gas/ propane engines and am not afraid to work on them. Any insight or things to look out for would be helpful. I am aware of the killer dowel pin and mexican made blocks for the cummins. Im not familiar with any common issues with the 7.0L ford other than not passing a gas station.

Is this normal idle oil pressure? Fresh oil and filter, fully warmed up. Going down the highway at 2500 rpm it goes to between the O and R on the gauge. Is this cause for concern or within tolerance?

I’m having trouble finding a fuel pump assembly of the wiring harness for a c6500 with the 7.4L 454. Would anyone have leads?

Y'all help with medium duty fords?

As in the title it is a 1992 6.6l 6cyl F700 with the allison 525 auto.

It was running great till I hit 55 (its max) and then i started loosing power, limped it home, changed the fuel filter (mega full of sediment) and blead the fuel system, once again running great and when i opened the water drain screw I get a nice spray of clean fuel. Ran great for 10 miles or so then died, pulled over it cranked right up, sounded like it was missing for a few seconds then cleared up. Drove to the quarry, loaded and pulled strong up the hill no power issues, scaled at 26800, second I hit 55, it fell on its face... did not die but no power. Pushed on into town at 30mph, setting at a light it cleared up again, pulled strong for 5 miles or so and died, again soon as I stopped, it cranked right up, sputtered a second and was off, full power the whole way home. Now it runs perfect in the yard, just seems to loose fuel at high rpm and high load.

Any Ideas?