Just bought an 2006 f250 with the 6.0. When I leave my house in the morning, the truck will wait along time between shifts. It will stay around 3k rpm and stay there a bit before it shifts. I'm driving normal it's about 45 degrees outside. Also , the gauge in the dash indicates the tranny is fully warmed up in under 5-6 minutes of easy driving in the morning. The engine temp has hardly moved. Any clues as to what may be happening would be great.

Thanks

 

The dash gauges are basically idiot lights, they go to normal early. What you are experiencing is pretty normal, truck protects itself and doesn't upshift as fast and uses a difference shift strategy. Mine has always done this, but soon as it gets over 140 degrees, it smooths out. If you had digital gauges, you would see the actual temps against the dash and you can read up on the cold shift strategy, it actually is a 6 speed, uses different gears in shift sequence when cold and warm. Try not to beat on it until she is up to temps. Coolant temp will show normal at 140 degrees, tranny will show normal at 50 or 60.

 

I've seen this happen on several 6.0L trucks. It's an engine problem. The engine isn't making enough torque when it's cold so you are pressing the pedal farther to make it accelerate normally. The transmission software sees the pedal further down so it delays the upshifts, but the truck isn't getting to that speed. So the shifts appear to be very late. I don't know what the engine problem is, but I do know you can spend a lot of money on the trans and it won't make any difference.

The cold shift strategy is only used when the transmission is colder than 0°F.

The trans gauge is calibrated to go to the middle of normal when the trans is at 50°F. That's why it jumps up so fast.

 

Are you sure it's stock and doesn't have a custom tune? I had a custom tune that shifted like crap cold and so did my neighbor, but stock or running a different tune the trans was fine.

Josh

 

My '04 does the same thing when ECT is under 150*. I think I have read somewhere that one possible reason this occurs is injector stiction.

Oil treatment products like Archoil 9100 or RevX might lesson the symptoms for a while.

 

Not sure if its got a tune or not. Is there a way to find out??

 

I know with mine I have some stiction issues and you would swear it is the tranmission, but it seems to hang in there until the oil warms and the injector smooths out.

 

Thats an EXCELLENT EXPLAINATION Mark!!! REPS GIVEN!!!!

I Agree Engine Issues

Iv had this problem with trans/shifting

And MY ROOT Cause was I found that my injector Orings Leaked Untill Warm once upto normal temp orings would expaned and seal and drive fine rest of the day

Solution was changed all 8 inject orings and Problem solved

Issues were
Fuel in Oil {smell}
Making Oil {Marked dipstick after 14 days of drive Oil would Rise went threw 2 rounds of High Oil leval drain some to good Area on dipstick and 14 days later High oil leval again} So it will take time to verify this since the Inject oring usually only leak untill truck is warm!!
Harsh Shifting
Shifting higher speeds
Downshifting out of Nowhere {Didnt do this Much though}
The trans would shift so BAD it was like I wondered if I was going to Break Down

Basicaly I had Low Fuel pressure condition with leaky inject oring or I think I did I dont have a Gauge for Fuel press check but only thing that made sense Plus after injector orings was all changed it drove like a NEW Truck again

So try to track it Down or Rule out Leaky inject orings ASAP cause Low Fuel Press will Kill Injectors Fast. The Injectors Plunger gets scared if Low Fuel press

Some report Inject stiction will do this too SO the Diffrence may be in how Rough the trans acts up

 

Mine acts that way also. I don't rev over 2k rpm until ECT gets to about 140, well, I try not to. Yea, that's babyin it but I'm trying to make it last. I don't hesitate to drive it hard once it's up to full operating temp though . If you're driving it easy and lift the throttle it will shift. I also idle up to 80 ECT before pulling out of the driveway.

You really need some gauges that plug int to obd port. Some of the ones on the factory dash aren't a whole lota help.

 

x2 on the injector issues. My dealer had to replace mine and that solved my problem.