Recently purchased a '96 F350, 7.3L XLT and of course after a few days I got a special treat, the OD light started flashing and the computer threw it into limp mode.
So far, I have taken it to the trans shop. Luckily, small town, good down to earth guy at the shop.
Read codes, only code it is throwing is P1728 (slipage, well no kidding). He reset / cleared the computer several times in between test drives with me in the truck trying to get it to throw more codes to give us more clues on where to start.
After talking to the guy I bought it from he admits he had the torque converter replaced approximately a year ago after the converter completely blew on him. What care was taken as far as flushing and filtering after it was replaced is unknown. I am just going to assume no precautions were taken.
I would love to be able to just get it rebuilt or replaced with built upgraded parts, but that is out of the question at the moment.
I haven't dropped the pan yet or anything. I am waiting 'til the 1st to do anything.
So far, per a thread I found I went ahead and reset the computer and turn the OD off each and every time I get ready to drive and all seems good enough for in town driving. Hoping this will get me by 'til I figure out what the real issue is.
The trans guy said if I want to "fiddle fart around" (per his words) and try to avoid a rebuild to drop the pan, make sure there isn't an obvious mechanical failure and start with flushing. See what happens, if it persists try to get a hold of a solenoid pack and replace it. If still persists, then a rebuild is the only real answer.
Kind of typing this out as it comes to mind, so forgive me for being out of sequence.
As is right now, with the OD on it will slip and get thrown into limp mode within a couple minutes of being at highway speed.
The trans guy, while driving with his computer hooked up to my truck, said he was getting no signal at all from the input or output sensors (he had a couple other trucks in his bay at that moment and admitted he couldn't recall if my truck had those sensors or if they read back the way most do) and by watching the tach and speedo he could tell the torque converter was not locking up like it should.
Any thoughts from any of you guys with experience with these trucks?
I'm willing to let this trans nickel and dime to around $400 before I throw in the towel and go for a rebuild / replacement.
As I am planning on doing some heavy hauling, I suppose the smartest thing to do would be to just rebuild, but I'll see where it takes me.
Walking along the side of the highway can be kind of refreshing anyways.
I'll keep searching, but if you have advice and could link me to related references it would be much appreciated.
Complete fluid / filter change complete per Chop's instructions, flushed the cooler and added a bottle of Lucas.
I didn't add the cooler or extra filter yet though, I'm trying to pinch a bit and didn't feel it was a necessity at this point. The fluid I drained out didn't look horrible, but to me it did have a bit of a burnt odor. No unusual particles in the pan, just the normally fuzz on the magnet although there was quite a bit of it. At least more than I am use to seeing.
Currently it feels a little "better", but I can still tell either the converter isn't locking up like it should or clutches could be slipping. It does however feel like just a little more power is actually being put to the ground.
Yes, it is still being thrown into limp mode and of course in limp mode I am getting the hard shifts.
I'm thinking next on my agenda is to research what components are responsible for making the converter lock up like it should. I know it is highly dependent on fluid pressure, that being said here is one idea off the top of my head.
A "Shift Enhancer" from Bully Dog for 90 bucks. I'm thinking if I can add new life to older parts responsible for controlling the pressure I may save myself from a rebuild.
Other than that, all I can think if is solenoids. That is what I will have to research before I decide what to purchase next.
Right now I am in it at about $150, as said before I will likely throw in the towel at $400 and plan for a rebuild.
Any further input from anyone would be greatly appreciated.