So I have a 2000 F-250 7.3 and my over drive won't work. I also had hard shifting from 3rd to 4th and 3 gear wouldn't try to shift until about 2500 RPMs which is high. I replaced solenoid pack and no change. I have rebuilt the tranny and found that OD snap ring had came off I put upgraded spiral ring on. When I went on a test drive I found out nothing had changed except shifted smoother. So I changed valve and accumulated body still no change. Truck is throwing 4 codes:
P0733 Gear 3 incorrect ratio
P0750 Shift Soleniod a fault
P0783 3-4 shift error
P0541 intake air heater a circuit low

Could it be PCM??

 

I suggest electrically checking the wiring from the PCM to shift solenoid A.

 

where is the shift Solinoid located? Is that part of my solinoid pack in the tranny??

 

Yes it is.

 

I cant offer much help, but I hope your luck is better than mine.....

https://www.ford-trucks.com/forums/1...-troubles.html

 

Okay thank you! So I found some chafed wire today that I am going to solder and then see what happens.

 

Thanks. I found some chafed wires and some that where busted and chromed back together from a previous owner which I am going to soder today. Hope it fixes it!

 

If that wire harness does not have any protection, plastic flex (wire loom) from the auto parts store is cheap.

 

It has that over it but definitely a good suggestion thank you

 

So I checked all the wires and there where some that had been crimped but they went to my transfer case for four wheel drive engagement. Do you have any other suggestions? Could it be bad PCM?

 

Did you check the wires electrically or visually?

 

Visually how can I check electrically?

 

Get a volt/ohm meter. Disconnect the harness at the PCM and at the transmission connector on the passenger's side of the trans.

Probe the BACK side of the connectors, NEVER the side the plugs into the other connector. With the meter on ohms, check the harness between the PCM and the trans for zero, or nearly zero, ohms for each wire individually.

 

If the ohm readings are high for a wire could that be the problem? All wires have a good connection I just haven't ohmed them yet just beeped them

 

High is a problem. That often means corrosion, usually at a connector.