E40D help... - PowerStrokeNation : Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 12-21-2014, 06:15 PM Thread Starter
PSN Newb
Join Date: Dec 2014
Posts: 1
E40D help...

New to this forum but need some help. My 1996 F350 7.3, 4x4 started downshifting this morning coming in to work. I was running about 65-70 mph and it would shift down into 4th and rpm would go up by 3-400 then down to 5th and rpm back to 1800 ish. This would happen repeatedly running down the highway with no rhyme or reason. This cycle repeated itself probably 25 times or more. Fluid is clean, smells good and have never had any issues with it in the 6 months I have owned it.


jmick01 is offline  
Sponsored Links
post #2 of 2 (permalink) Old 12-22-2014, 07:15 PM
Former Ford Trans Engr.
Mark Kovalsky's Avatar
Join Date: Aug 2007
Location: SE Florida
Posts: 3,029
Re: E40D help...

My first thought is that what you described is impossible. You have a four speed transmission, not a five speed. So it can't shift to fifth gear, there are only four gears.

You might be seeing the torque converter locking and unlocking. Or it may be shifting from fourth to third gear. What happens if you press the OD OFF button to keep it from shifting to fourth gear? Then if it does it we know that the problem is the torque converter locking and unlocking.

Former Ford Automatic Transmission Engineer

ďThe good thing about science is that it's true whether or not you believe in it.Ē ― Neil deGrasse Tyson
Mark Kovalsky is offline  

Quick Reply

Register Now

In order to be able to post messages on the PowerStrokeNation : Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome