Help Master Mechanics...Been following the forums for years but I am lost now on what the problem I have.

Spent hours trying to find out what trans I have. Ford dealer ran the vin and says I have a 4r55e. Ford Ranger Automatic Transmission Identification says I have a 4r44e. Pepboys says I have a 5r55e. Not sure if it identifies it but this is on the trans.. RFXL2P-7006-AB 750Nm. 95GT-7A040-8A.

On to the strange problem. Its been running a little rough and once in a while I will get misfire codes from Cylinder 1&6 . Just started to notice when the car is in OD doing about 60mph it will jerk or serge a little. I thought maybe it was the misfire. If I turn off the OD it does not do it anymore.. Been getting worse last few weeks. Have never had any codes for transmission. Have had a few on O2 sensors error codes.

So I replaced all three O2 sensors and then the new problem started. I drove it once with the new sensors and rand about the same. I turned the car off and when starting and driving again I noticed the motor was much louder and shifted harder in all the gears. Also it started to squeal a little. Once it gets into OD its kind of ok but if push off the OD button is squeals getting back into drive.

So since it got much worse after putting the new O2 sensors I decide to put the old ones back in. Well it switched back to normal and much smoother also the motor was quiet again and shifted the same with light jerking in OD.

Now I put back in each new O2 sensor and drove it before putting the next to see if one sensor was bad. But I put all three and was fine. Then after driving for 20 miles when I was playin with the OD button it got loud again and squealing again. I disconnected the battery for 2 hours to see if it would reset and no luck.

So what do you think? Sticking solenoid? Maybe MAF going bad? I got new oil and filter ready to install and bought a 1/4 drive torque so I can adjust the OD Band. Not sure if I should put a shift kit and change solenoids and valve body gasket.? I would hate to do all this and have the same problem and need a full rebuild.

I will also try disconnecting MAf and see if it drives different. Again no codes using my AutoXray scanner.

Anyone got any ideas? Thanks....
https://www.ford-trucks.com/forums/i...es2/smhair.gif

2000 Ford Ranger
V6 3.0 flex fuel
2 WD
Automatic trans
250,000 miles
Only owned it for 20k miles
Fluid level good
No Leaks
Only codes I get is Cylinder 1&6 misfire
Just changed all 3 O2 Sensors

Casting on trans.
RFXL2P-7006-AB
750Nm. 95GT-7A040-8A

Vin Number
1FTYR14V4YTB11441

 

I would drop the pan first, and see whats in the bottom of it, if there is lots of friction disk material or metal flakes, or small pieces of thin paper gasket, replacing parts or adjusting won't help any.

 

Greetings.
You should have a 4R44E tranny in that particular truck. The 4R55E was only included with the 4.0L Ranger from years 1995 to 2001. The 5R55E (Well known for its problems) was included with 1997 to 2009 4.0L Rangers (1997-2001 Explorer w/4.0L).

At 250k miles it is possible that someone at some time swapped out the trans for a different one at some point in time. Probably the 4R55E as its very common.

If you haven't tried this yet I would drop the pan and replace the fluids filter, and valve body gaskets. Its not terribly hard but it is quite the under taking. I found this video useful.
If your seeing lots of metal debris in the pan It might be time to have the transmission rebuilt entirely.
*edit* If you suspect you have a Frankenstein truck (I have one myself) Try running the casting numbers by the Ford dealer and see if they still come up as a 4R55E

found this video as well, it explains common issues pretty well. (Not my favorite technical speaker, but he touches on some good info)


Hope this helps!

 

Update. I tried a new oem MAF and no change. I also adjusted both bands on the transmission. Still have the same problem. The motor is still loud and sounds like it working hard like pulling a trailer up hill. But with the problem switching on and off leads me to think its electronic . Please help... What could I try next?

 

Also thanks Asyke for the videos..