I was driving my 7.3 down the road and it started acting like the trans was slipping, it reved up and tried kicking down a couple times and when I slowed down and went to speed back up it just had no power coming through the trans to the wheels it just reved. I put it in neutral and it idled up for about 5 seconds. I put it in park n shut it down. I fired it back up after looking everything over and it moved about half mile down the road and no power to the wheels again. The trans is full of fluid, is there a sensor that could of went bad or just the torque converter or the entire thing shot? Any info from experience in this situation from your guys greatly is appericated. Only owned my truck 6 months has a trans and motor swap already from previous owner. 180k on current motor n Trans. 382k on my truck. t6 4" turbo back banks exhaust only mods I know of.

 

It is very unlikely to be the torque converter. There is no sensor that could cause it. The trans has had an internal failure.

 

I have 10 people telling me all the signs point to a failed torque converter but one guy directed me to this forum. Why does it start back up and drive down the road again and then all a sudden stop sgain? Every trans I've broke b4 never did this. There is a scraping noise coming from right near the pedals when it's going.

 

I have never seen a torque converter fail and then work for a short time again, then fail again. I've seen broken flex plates do that, and failed clutch seals inside the trans.

 

That sounds like the filter is clogging up, problem with that is what is clogging it up. The filter can pick up enough debris to stop the flow of oil to the pump, when this happens the transmission quits pulling. Shutting the engine off can allow oil and debris to flow back out of the filter somewhat unclogging it, then when you start the engine again the tranny will pull until the filter clogs up again.

Many things can cause this level of debris and the converter is the most likely suspect IMO, either way this tranny is going to require a complete rebuild.

 

My truck did this very thing today. Yesterday it did this and when I let off the pedal, it went back into gear and drove fine. Today when it did this, nothing helped. I pulled into a side street and stopped. I put it in park for a minute then pulled it into drive. it started then nothing again. I pressed the button on the end of the shift handle to put it in tow mode and turn off overdrive. I felt the transmission go into gear. I drove it home that way and it pulls fine and handled fine. If I turn the overdrive back on, it starts acting up again. If the transmission has died, then why does it drive ok in tow mode? The truck has just tripped 220069 miles. I have put over 100000 of them since I have owned it. It gets regular fluid changes and the works. The tranny temp stays around 150 to 153. Any ideas?


Oh sorry about the high jacked thread, but there has been no replies for a while and I found this thread during my search.

 

when the trans seems to neutral out on you while driving,then goes back into gear,it's 99.9% chance the range sensor has failed.

i don't understand why you said this here Mark.

is there something different between how the range sensors between the e4od and 4r100 work?

 

Where is this sensor located?

 

it's under the shift linkage on the drivers side of trans but doing a very brief google search,it looks like they switched to a digital range sensor to address the older e40d issue where it can fail and cause a neutral.
Mark will clarify for us.don't buy any parts.doesn't sound very promising for it being something simple for ya guys.bummer.

 

No, not true.

When the range sensor fails it will shift the trans to first gear. Going down the road this feels exactly like neutral. As I read the post above it describes no movement even from a stop. If I read that right it is a mechanical failure. If it only goes to neutral at higher speeds but works from a stop, then it could be the range sensor.

Yes and no. Nothing that would affect what we're talking about.

 

What truck?

That's very confusing. Up until the 2003 5R110 there was no tow mode. There was an overdrive off button on the end of the shifter, but tow mode hadn't been invented yet.

Starting with the 5R110 the button would now put the trans in tow mode. But then there was no way to turn off overdrive.

You're describing both. It doesn't work that way. If I knew what your truck was I could tell you which one you have.

If it is a 4R100 I think your problem is a failed overdrive one way clutch. When you turn off overdrive it engages the coast clutch which replaces the overdrive one way clutch. When you enable overdrive the coast clutch releases and the one way clutch has to take the load.

 

Update.
My truck is a 2000 F250 4X4 with the 4R100. The button on the end of the shifter IS the overdrive off/on button.
On Friday we put the truck on the scanner to pull a diagnostics and transmission codes. It wanted us to get the transmission warm and to drive it. It would only move if I had the overdrive switched off... It made it out about 1 mile then we turned around. It made it back to my development but died about 1/4 mile from home. This time the neutral feeling happened, the temp went to 182, and that smell came up of burned crap... It is now in the shop getting a Jasper Class 1 installed...