We have not had to change out a Triton engine as of yet. I doubt seriously if many people could switch this motor out in 19.5 hours. You will probably spend at least 8 hours changing parts over once the engine is out. I believe a rebuilt engine with heads is over $3000 (not list). I hope you have a good back as you will be laying over the front for a while. The last 4 cylinders are under the cowl of the cab. Any time you work on a 4WD, that takes longer. $1000/40 hours=$25 hour..