E4OD Harsh 3-4 shift/ Torque Convertor Lockup

[jeffrall]

Hi All,

I have been doing alot of serching and am not sure if any of the threads that I found directly apply to my truck. It is actually a '94 E 350 U-Haul.

It has the 7.3 IDI and the E4OD. I will be checking the RPM sensor and the FIPL sensor as others have suggested.

My problem is that the transmision shifts O.K from 1-2 and 2-3. Then the TC locks up in 3rd, unlocks shifts to 4th, and "WHAM" [img]/ubbthreads/images/graemlins/eek.gif[/img] the TC locks up at about the same time that it shifts from 3-4. It seems to shift early if I am under light acceleration. (In OD with the TC locked up by 35 MPH [img]/ubbthreads/images/graemlins/shrug.gif[/img]) If I am under moderate to heavy acceleration, it seems to shift ok and less of a harsh/slam lockup of the TC. The 1-2 and 2-3 shifts seem OK.

I also have no flashing of the OD off light which I am told will indicate problems with the control circuit.

I have also recently drained and refilled the transmission and changed the filter. (Yes the filter is the correct one for this truck. It takes the 4x4/deep pan filter) I did not drain the torque convertor. I have verified that the transmission fluid is serviced to the proper level.

I did find a good bit of ferrous particals and sludge attached to the magnet when I took the pan off. [img]/ubbthreads/images/graemlins/shocked.gif[/img] [img]/ubbthreads/images/graemlins/ooo.gif[/img] (About a handfull)

Any suggestions? [img]/ubbthreads/images/graemlins/confused.gif[/img]

[cdnsarguy]

Does the speedo work OK no fluctuations..... No tach in Eseries. Do the FIPL and see what happens..... A handfull of stuff is a good amount, but it was Uhaul. Is there an OEM tag on the trans still.

[Mr_Roboto]

There are no cut and dry answers.....

Check and set the FIPL sensor first, then if the problem is not corrected change out your tach and VSS sensors.

[jeffrall]

The speedo acts like it is cable driven sometimes (which I know it is not), so you may have somthing there, that the VSS may be erratic. It has never fluctuated more than 1-2 MPH though. But the other shifts are nice and smooth [img]/ubbthreads/images/graemlins/shrug.gif[/img]

The trans appears to have been replaced at some point. I got the maintenance records for the past two years when I bought it. No mention was made in that time about a trans. replacement. [img]/ubbthreads/images/graemlins/shrug.gif[/img] [img]/ubbthreads/images/graemlins/ooo.gif[/img] It looks to be a Ford reman. trans. At least that is what the sticker says (Ford Quality Remanufactured)

It appears that U-Haul gets all of their replacement parts from Ford [img]/ubbthreads/images/graemlins/cool.gif[/img]