CM870 head out after 40k, ECM calibrations, mechanics or parts?

[andreisana4]

(05-20-2016 )gearhead Wrote:  quickserve has a vin to esn feature.

I know that for some people work better to install a new or another used engine to the truck then to rebuild it, save time and money, I am afraid those from Quickserve can`t see that , especially if the engine switch is done at a small not licensed shop.

I found 2 matches on my truck and I think I know the right ESN already,

Thank everyone for help!