Truck drives normal in 1st, and 2nd.
As soon as it shifts in to 3rd, it acts like it's in neutral.

Not good.

Any thoughts?
Is this thing toast?

2007 1500 4x4 quad cab laramie

 

Does it come out of third? When is the last time you Serviced it?

 

3rd is like neutral, so I don't know.
Do you mean does it downshift back to 2nd?

I don't know that last service date, It's been a while.
It couldn't be just fluid could it?

 

P0733 Gear 3 Incorrect Ratio
P0734 Gear 4 Incorrect Ratio
P0735 Gear 5 Incorrect Ratio

Check fluid level. If not that, possibly TCM or time for a rebuild.

 

Fluid level looks ok.
Looking through my records it's been at least 2 years since atf fluid change.

I must amend my first description, 3rd is not quite like neutral, if you increase revs, it has some go to it...so I guess it's slipping.
It does down shift, but never goes higher than 3rd..at very high rpms you can get to about 59MPH...

Why would the gear ratios be wrong?

 

Does it shift past 3rd. I know you said its like its in neutral but sometimes it will slam it to the next gear.
Like kenney said check the fluid, and go ahead and smell it see if it smells burnt. Likely no its not just fluid but its always worth a check
Maybe time for a rebuild

 

It does not get past 3rd.
You can tell the fluid is used, it is no longer that bright red color, and it smells different, but I wouldn't say it's burnt smelling.

 

I would have it looked at by a shop. More than likely your are going to have to get a rebuild. Some people have luck servicing the tranny and replacing the selonoid but i dont think you will have the same luck

 

Tranny issues are real hard to diagnose now a days with all the solenoids and sensors...
If this occurred after off roading check the Transmission output speed sensor and the wires for damage... its located on the d/s rear of your transmission. $40 bucks to swap a new one out ....I'd start there.

 

Thanks for you replies.
This truck has been offroad a bit, but not recently.

I guess I will have it looked at Monday AM and hope for the best.

Thanks for your help.