6.4 Tranny Problems
I got a very used 2010 F250 6.4 (200,000 miles)
When driving without anything attached, all is well. Turbo will spool up to 35psi, all gears work great. No error codes.
Issue: I attached a 6,000lbs box trailer to it, couldn’t go faster than 65 max (most of the time between 50 and 60 was max...