So I have a '96 Explorer Limited, 4.0 with the 4r55e. It has a hair over 160k on it.
Here is my question, I thought the valve body gaskets where blown because it would have pretty hard up and down shifts SOMETIMES. It's very random, some day's it would do it.. Others it wouldn't. Then I was reading if it has engine braking in manual 1st gear.. The gasket's are ok. I'm pretty sure I've used manual 1st before and felt engine braking. Will check tomorrow on that.
Then I was reading and was thinking possibly it could be the Electronic Pressure Solenoid (EPC). Another thing I noticed is the torque converter doesn't lock up, I was thinking it could be the TCC solenoid.
After a while the O/D light does blink, I'm gonna have it scanned tomorrow at work.
Some more reading I see both the EPC and TCC solenoid's are high wear items.
So drove the truck this morning to work. I tested and have manual 1st engine braking. Actually I have manual 2nd gear braking too.
Got to work and the od light was blinking. Pulled the codes and got 2. A VSS code (forget the number) (speedo has a bit of a wobble at certain speeds, pretty sure that's the cause of that code) and a P0741. So it's throwing a TCC SOLENOID code too.
Alrighty. So I put a new VSS in on my lunch break. Speedo is a little wobbly still but doesn't seem to be as much. The old sensor was a Ford part, so probably the original. The truck seems to be shifting better but I'll give it a few days to see. My buddy has a scanner and the computer is commanding the tcc to lock but it isn't. I'm still gonna check the ohms and go from there.
Well it WAS shifting soft/normal.. then one day it was back to hard shifts. Today was soft, so not sure if it's a loose connection or what. I ordered a new EPC (red screen) and a TCC solenoid. So when I drop the pan I'll double check all the connections.