New truck 4 me how's transmission

[CumminsE263]

Long story short I have 07 quad 6 speed 5. 9. Found 07 5. 9 mega cab auomatic trans,dully want for extra room for family and dully for towing. My only concern is how are the the auto trans in this truck and approx how many miles do you get out of them. I know it depends on the type of driving, but can I get some input on this transmission. THANKS Jeff. PS this truck has 70,000.

 

[BDaugherty]

One of my customers has the same truck you are looking at. He has nearly wore the hitch from towing and the stock auto trans is still hanging in there at 200K. His engine is stock and the trans has been serviced maybe 3 times.