04.5 6.0 PSD F250 studs and origed head stage 1 turbo 175/30 injectors
Hello looking for some awnsers
Recently replaced some parts on my truck including rear end, same ratio and everything but i don’t think it had anything to do with my issue. about a week or so ago me amd my girlfriend left to go to my buddies grad party and stopped to get fuel. she had forgot something at the house so we ran back and my negative battery terminal fell of and it shut truck off, put it back on and all was good until we left again. pulled out truck shifted 1-2-3 fine but slammed into 4th stupid hard then jumped in and out of 5th 3 times in a 5 second time frame and then towhaul flashes and no 5th. whats strange is after that the truck will shift3-4 just fine if its flashing but if its not it slams. still have tc lock up in 4th. sometimes if i let it sit for awhile and drive it it will shift perfectly normal no slipping or anything. codes being thrown are p0766 and p7203 so i started by changing the direct drive solonoid as well as filter and fluid had some material in pan but not much at all. no change. im at the point were i believe tranny is smoked but whats weird is it shifted fine never slipped until the terminal fell off no temp spikes or nothing.(temp dosent spike atm either) so before i go spend 5k on a built trans maybe its a simple fix.i also have delayed reverse ingagment as well as drive.

 

Get something that can read the transmission codes and post what you find.
Not all scaners can read the codes from the transmission. Something like Forscan
is what you want to use to get the codes.

 

codes are in there in the thread if ya read it all the way

 

Don't get snippy, sometimes it is just a lot easier to see the codes if they are not buried in a novel. Or maybe just highlight them.

 

P0726 : Engine Speed Input Circuit Range/Performance. Edit, I see it really is P0766.

Not sure what p7203 is.

P0723 (if that is what you meant to post) is Output Shaft Speed Sensor Circuit Intermittent

So why did you change the direct drive solenoid?

 

codes are p0766 Shift solonoid d performance/stuck off p2703 Transmission shift element d apply time range/performance

 

You might want to correct the "P7203" in the first post, since you meant P2703.

What are the actual transmission fluid temps?

When you changed the filter, was it the external filter or the one inside the pan.

 

in the pan and 150 160

 

Those temps look ok. I believe I see up to about 175. The filter in the pan usually doesn't need to be changed. I changed mine at 150k miles "just because". The external filter is the one that needs to be changed, at least every 30k miles. I do it every 20k miles. Hopefully a transmission expert will come along and provide you with some specific direction.

 

Odd that a Neg cable coming off would kill the motor. You have two batteries and thus 2 ground cables so the bad ground situation may have fried something. Think I would see if Forscan can monitor the Transmission speed sensor PIDs to see if that gives any clue to what might be going on.

 

thats what i was thinking i agree with you

 

A ground cable coming off isn't going to fry something unless it hits the positive terminal or un-insulated positive connections. If it did, you would probably see some fuses or fusible links blown.

Now a marginal/poor grounding plane could cause the control modules to shutdown if the drivers side battery ground came off.

 

yes that is the side that came off but wouldnt a relearn fix it then

 

Probably would. To me the issue sounds more like it is a result of poor fluid filtration. The internal transmission fluid filter is not a very "fine" filter and is not meant to really keep the fluid clean. That is the job of the external filter (unless an 08 transmission pan and filter were installed).

 

P0766 can only be set by a stuck shift solenoid D. Shift solenoid D controls the direct clutch, which is used in reverse, fourth, and fifth gears.

It is strange that you replaced solenoid D and there was no improvement. That should have fixed it. Here is a diagram that shows where each solenoid is located.