Possible transmission issue??????

[LASVEGAS7.3IDI]

So my sons 04 4x4 F250 6.0 when running down the road @ 70mph is running at 2500 on the tach and doesn't seem to want to shift this is something new usually the tach reads 1600 when on the road. Any suggestions will be greatly appreciated

 

[79jasper]

Need to see if it's throwing codes.

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[LASVEGAS7.3IDI]

No ces light on the dash

 

[IDIoit]

od light flashing?

 

[LASVEGAS7.3IDI]

Nope

 

[snicklas]

Could is be "stuck" in Tow/Haul Mode? The the 70@16-1800 is about right. Mine will hang out at the 22-2400@70 in T/HM when towing, but will eventually settle in to 6th and drop back to 16-1800....... If you push the button, does the Tow/Haul light come on? I agree, it needs to be scanned, just because there is no CEL, doesn't mean there isn't a code......

To clarify my 6th comment.....

The 5R110 actually has 6 gears. when the transmission is cold what should be the 4th to 5th shift (next to last, and highest gear) is not a smooth as the engineers would have liked. So to correct the issue, there was a 6th ratio added to the transmission, so 4th gear and 5th gear are ALMOST the same ratio, but not exactly. So a 5R110 when cold, actually shifts: 1,2,3,4,6 and once it warms up it is 1,2,3,5,6 so most of the time it is the second pattern.

 

[FordGuy100]

The 5R110 is a 3speed with a overdrive on the back. So it goes something like:

1st-direct
1st-overdrive
2nd-direct
2nd-overdrive
3rd-direct
3rd-overdrive

I'm certain that is not actually the shift pattern, but it gives you an idea what is going on in it.

 

[Dsl_Dog_Treat]

No ces light on the dash

Mine didn't throw a CEL when it acted up. Really need to get it on a scanner that look at the trans to see what it's doing.