Money pit.
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New User
Joined: Nov 2016
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Money pit.
Hi everyone, I am chris and a new member. I have been reading your form and it seems to be the best one I can find. Lots of knowledge from the members. I hope you can help me. I have a 95 f150 I got for my son when he turns 16. It has the 351 with the E4OD. It shifts hard and goes into limp mode when the transmission gets up to temp. The spedo works and the only ligt that comes on is the O/D on the shifter. I had the transmission, transfer case and rear end completely rebuilt. They were all in bad shape. I am still getting a speed sensor code. Everything is new. Including the speed sensor and plug that goes into it. The main plug going into the transmission is in good shape also. The shop and transmission guy are telling me it's something electrical. I am not sure if it is a bad wire, psom or maybe the ecm. I hate to keep throwing money at it. But the previous things were all in bad shape. I have a feeling it's something simple now but don't know which direction to go. Any advice would be greatly appreciated.
Thank you.
Thank you.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
Read this thread, this is a common issue on these trucks of a PSOM failing.
https://www.ford-trucks.com/forums/1...ff-light.html#
And more info here: https://www.ford-trucks.com/forums/1...-shifts-2.html
https://www.ford-trucks.com/forums/1...ff-light.html#
And more info here: https://www.ford-trucks.com/forums/1...-shifts-2.html
Fleet Owner
Joined: Oct 2005
Posts: 20,780
Likes: 1,746
From: Kentucky
Very slim chance a dealer has or can locate a new one. They have not been made in years.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
I doubt you will find a PSOM at the dealership, if you do its major $$$ for it. Best place is the junk yard, but watch out those could also be bad too. I had a few bad ones from the yard which caused some headaches diagnosing things!.
When you do swap he PSOM out, you will loose the milage and speed ratios of your original PSOM. You can reprogram the ratios in to the other PSOM but not milage unless you can either swap the EEPROMS or reprogram the EEPROM with your original PSOM data
When you do swap he PSOM out, you will loose the milage and speed ratios of your original PSOM. You can reprogram the ratios in to the other PSOM but not milage unless you can either swap the EEPROMS or reprogram the EEPROM with your original PSOM data
4wd Low
Joined: Oct 2016
Posts: 14
Likes: 0
From: hurricane
chris, had the same problem with my f350, different tranny but same situation, the two trannys are about the same just one is the heavy version. no shop could figure it out "until one did!" it was a torque converter failure, how, no one knows. but if it was driven had at all, it started the flashing o/d and started the heavy shifting, then pull the battery cable and reset. it was causing a tranny overheat. so maybe its a tranny heat sensor also? but the tranny has its own computer, that is not completely linked to the ecm, so when you see flashing o/d light the tranny computer shut down and the tranny is in manual mode, shifting on pressure not electronically assisted. so it may be a overheating problem, sensor, cooler, converter, maybe even a slipping that is not felt causing a friction. just have a shop do a temp test on it or test the sensor, it will not show up on a diagnostic
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