Miles? In that case, I think I would be looking for a MUCH lower mileage motor to toss in there.

I thought these were indestructible engines? Well do the 5.9s use the same transmission.

Exact same trans.

They are rugged, but, more than 300K miles? It ain't a diesel.

Gotcha well I will be searching for one then, I've heard that they use all the same parts basically

Where ya at? I actually have two sitting around the shop here.

I have a 5.9l with the same symptoms. Would it be beneficial to swap motors on mine as well?

I'm in va.

That would be a heck of a drive for a cheap motor....... Spend more in gas, than you would just getting one locally.

Yeah unfortunately around here is buy and guess so I can easily end up in the same issue or worse.

So pick one up cheap, go thru it. (gaskets, seals, rings, bearings) Then just swap 'em over. That way, you can still drive your truck while rebuilding a motor.