I have a 2006 F250 with the 6.0 PowerStroke and automatic transmission. I just purchased this truck at an auction about a month ago.


Today I notice the transmission is not shifting into overdrive. No warning lights. If I press the tow/haul button in no change but the tow/haul light does come on. If I press it again (to turn it off) the tow/haul light goes out but still the transmission will not shift into overdrive.


This leaves me at about 2000 RPM at 68 MPH. I just had a Ford dealer perform Transmission service last week. (20,000 miles after the last recorded service.)


I am already not happy with the service I received at the dealer so I am really hesitant to take it back to them if it is something not related to the transmission service they performed.


Any one have any idea of what the problem could be?

 

2000 RPM at 68 MPH sounds like it's in 5th gear to me, assuming you have 3.73 differential gears.

Keep in mind, T/H mode does not lock out O/D, it changes the shift map below 60 MPH.

 

I don't see a problem. At that RPM and speed the transmission IS in overdrive.

From a rest count the upshifts.

 

Perfectly normal to me. I bet you had a 4r100 tranny in the past and believe the tow/haul button works the same as the O/D button from earlier years. Just not the same.

 

Thanks everyone. A friend of mine told me he is usually at 1700 RPM at 68 MPH with his 2008 F250 diesel.

 

Just can't compare those numbers, 6.0 vs 6.4.