Transmission slipping from 3rd gear to 4th

[modyy22]

I have 2011 f150 raptor svt 6.2 my transmission starts to slip from 3rd to 4th only and the rpm will go high but then it will engage normal the other gears work perfectly, I replaced the trans oil and filter and still the same problem, I took it to a mechanic and he told me maybe i need to replace the lead frame for the valve body and he’s not sure he’s said that he’s getting a tcm code!! and I can’t find the correct part online that will fit the 2011 Ford raptor please help and suggest the problem . Thank you

 

[FordTechOne]

It sounds like your mechanic may be guessing. Do you have the list of DTCs that are setting?

 

[modyy22]

Unfortunately no but I’ll try to get the DTCs from him, he just told me that he’s getting the tcm code!!!

 

[B E N]

What is the mileage on the truck? Abused or babied?

 

[modyy22]

Around 100k not abused at all

 

[B E N]

Read this:

https://latemodel.cachefly.net/downloads/tsb05-14/tsb13-06-08.pdf