E4OD Intermittent shifting issue
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4wd Low
Joined: Aug 2017
Posts: 13
Likes: 1
E4OD Intermittent shifting issue
Hey guys. I've got a 1997 F250 HD 4x4 with a 351W and E4OD transmission. I had a Jasper remanufactured transmission installed about 5 years ago. I've only put about 40,000 miles on the transmission. It has been great until the last few months. There are times when I take off down the road and the transmission will constantly shift up and down until the truck reaches about 35 mph. It doesn't do this consistently. Temperature doesn't seem to make a difference either, as it has done this cold and after the truck has reached operating temperature. I had replaced the PCM about a year ago, and just recently replaced the Throttle Position Sensor. The issue is still there, but it only does it every now and then. Any advice is greatly appreciated. Thank you!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,698
Likes: 2,620
From: SE Florida
If the speedo is bouncing the speed signal to the PCM is probably bouncing, too. That signal is used to determine when to shift. If it gets bad data it's not going to work as expected.
Sometimes it's debris on the vehicle speed sensor, or a bad sensor, or a damaged wire, or a bad PSOM on the back of the speedometer.
Sometimes it's debris on the vehicle speed sensor, or a bad sensor, or a damaged wire, or a bad PSOM on the back of the speedometer.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,698
Likes: 2,620
From: SE Florida
Here are a few other things you could look into.
Senior User
Joined: May 2014
Posts: 287
Likes: 1
From: Cedar Lake, IN
"Remanufactured"...that is the cause of the problem right there. I have learned from experience that rebuilt is a better choice than remanufactured.
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4wd Low
Joined: Aug 2017
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Still having issues
Hey guys. I’m still struggling with the shifting issue with this truck. The issue is now constant, not intermittent.I have double checked wiring and found no obvious issues. I will replace the sensor on the speedometer next. If this doesn’t fix the problem, what should I try next? No OD light flashing and no codes. Many thanks guys
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,698
Likes: 2,620
From: SE Florida
I've never understood the difference between remanufactured and rebuilt. Can you explain it to me?
Hotshot
Joined: Jun 2015
Posts: 12,781
Likes: 2,422
Knowing who rebuilt / remanufactured your transmission is better than something from a factory. When I worked at the Chrysler dealer, the Mopar reman units clutches were probably set up in spec but didn’t shift as good as the ones that had been rebuilt in house. We could and did set the clutch packs up at the “tighter” end of the spec to allow for wear.
Fleet Owner
Joined: Jul 2006
Posts: 20,344
Likes: 801
From: Mi'kma'ki
Hey guys. I’m still struggling with the shifting issue with this truck. The issue is now constant, not intermittent.I have double checked wiring and found no obvious issues. I will replace the sensor on the speedometer next. If this doesn’t fix the problem, what should I try next? No OD light flashing and no codes. Many thanks guys
Smacked it and it works! but why?
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