shift 1 through 6 like it is supposed to but overdrive did not work

Hello, I am Danny.

Quick question first. Is the Check Engine Light on? A code might be stored for your Transmission issue.Having the Check Engine Light on means there is a fault code stored in your car's computer. Having the code checked is a great way to star diagnosis of your car's problem. If you do not have access to a code reader/scanner your local auto part stores (Autozone, Pep Boys, O'Reilly's) will check for free. If you get back to us with the code number(s) we will be happy to help. I have attached a tutorial showing what is involved with checking codes. Hope this helps and feel free to ask any questions. Thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Yes. The two newest codes are gear 4 ratio and low pressure sensor c circuit.

Hello,

Can I get the code numbers please? It sounds like the input shaft sensor is not working right or you have a shift solenoid that is shorted out. Please let me know.

Where is the input shaft sensor located at?

I replaced the shift solenoid pack.

I have replaced both speed sensors and the transducer.

With that many codes we need to clear them. Then without starting the truck turn the key on then scan for codes again to see what comes up. It looks like we have one issue causing the problems. This hard code check will point us in the right direction.

I did that. The 2 codes that popped up after I cleared them and drove was p0871 and either p0882 or p0871. I will do it again.

Yes, clear the codes then don't start the engine, just turn the key on then run the codes.

I did that and no codes popped up.

Excellent. Now start the engine and shut it off and run the codes do not drive it.

Okay. I did that and still no codes.

Okay cool, so we got p0882 and p0871 both transmission related codes. I have seen the TRS go bad causing the codes but we should do a pin th pin to make sure the connection are all good. Here is a guide to help us with that and the transmission wiring diagrams so you can see how it works with instructions on how to change out the TRS.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what happens.

Cheers, Ken

I seen that one of the pictures was for a 1500. I wanted the make sure that it didn't make a difference.

They should be the same, let me know if the colors do not match up but they should.

Where is the trs located at?

Check out the diagrams above, it looks like the TRS is located in the valve body.

Is everything the same as the 65 rfe as the 66 rfe? The diagram shows it is a 65 rfe. My transmission is a 66 rfe.

I replaced the transmission solenoid pack already. And I have replaced both speed sensors and the transducer.

Nice, what is happening with the transmission?

The transmission started acting up shifting into fifth and sixth. It acted like it went into limp mode. So I checked transmission fluid. When I did I noticed that the dip stick tube was broke into where it bolts onto housing. If I put transmission into fourth gear manually it shifted just fine. But overdrive did not work. Then it started acting up when it shifted into fourth. Now it only works if you shift it into third manually. If it shifts into fourth, the RPM's go up like it is slipping and you cannot get it to shift out of fourth. The only way to get it to work again is to stop put truck into park and turn ignition of and restart truck.

It sounds like the transmission is going out or the PCM, but we should do a pin to pin test using the wiring diagrams from earlier and follow this guide to confirm.

https://www.2carpros.com/articles/how-to-check-wiring

If you want to try the PCM here is the location you can get a programmed unit from eBay.

Please run down this guide and report back.

Cheers, Ken

Now it says engine is hot but it is not. And it says 4x4 temporarily unavailable and service engine throttle body.

Okay then let's service the throttle body start by disconnecting the battery and when you are done clear the codes.

https://www.2carpros.com/articles/throttle-actuator-service

Remove it to clean it thoroughly then clear the codes and retry.

https://youtu.be/ahK_eucFi-k

Please let us know what happens.

I cleared codes. P0118 pops up when I turn key on and run codes.

That is for the engine coolant sensor which can cause all kinds of issues. Let's check the connection at the sensor if all looks okay replace the sensor. Here is a guide to walk you through the steps and the location of the sensor for your truck below:

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Clear the codes when completed. Check out the diagrams (below). Please let us know what happens.