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Discussion Starter · #1 ·
Took my new '94 Bronco out for its first long run today
It has 125,000 mi on it and appears to have been used for towing something large
(It had a trailer brake box by my right knee that I removed)
On the way home, ran into some traffic and it started shifting hard, banging into gear

I think I've heard alot of posts saying this is typically the life of one of these trans AND it towed something heavy
I'm not too optimistic

Are there and 'preliminary' tests that can be done aside from checking the fluid level?
 

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Heavy line pressure caused by a faulty circuit.
Check TPS
Check VSS
Check circuitry between PSOM and PCM

@MS88Bronc just solved his issue. Was circuitry between PSOM and PCM
 

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Discussion Starter · #3 ·
Would a transmission specialist be able to detect this or will they just throw a transmission and thats the end of it
I have never replaced an auto trans on anything I have owned
 

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Would a transmission specialist be able to detect this or will they just throw a transmission and thats the end of it
I have never replaced an auto trans on anything I have owned
You take it to a trans guy, and your looking at a full rebuild for about $2500, and will probably STILL have the same issue.

Something most likely is telling or not telling the PCM how to operate the trans properly.
 

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‘95 Bronco XLT 5.0 E4OD, MAF——‘95 F150 XL 4.9 M5OD 4x4, SD
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Heavy line pressure caused by a faulty circuit.
Check TPS
Check VSS
Check circuitry between PSOM and PCM

@MS88Bronc just solved his issue. Was circuitry between PSOM and PCM
Do you know if a line pressure issue, heavy or low, could cause TC lockup prematurely?
One of mine does this after it warms up regardless of what gear selected and independent of the ecm. (I cut the P/Y line to check). It locks and stalls when put into gear.

Sorry to hijack lol, this is my only question.
 

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Do you know if a line pressure issue, heavy or low, could cause TC lockup prematurely?
One of mine does this after it warms up regardless of what gear selected and independent of the ecm. (I cut the P/Y line to check). It locks and stalls when put into gear.

Sorry to hijack lol, this is my only question.
Your issue is most likely a bad PCM/ECU. The purple/ yellow wire is the control wire to lock the converter. The computer is locking it too soon.
 

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‘95 Bronco XLT 5.0 E4OD, MAF——‘95 F150 XL 4.9 M5OD 4x4, SD
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I’ve replaced the computer. I said I cut the line that controls the TC lock up and it still did it. It should have been free to move at that point.
 

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Discussion Starter · #11 ·
Would a freaky trans pop an OBD I check engine light? (see my other post)
CEL light has come on, and then I restart it and it does not light up again....odd
Thought once you pop a CEL code it stays there until you erase it with a scanner
 

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Discussion Starter · #12 ·
Took a code scanner and got 2 OBD I error codes:

172: H2O2 sensor fault / lean
452: VSS sensor signal fault

JUST LIKE Sackman said above, so I have to check or replace the item

Now, WHERE is the VSS located on a '94? PLEASE do not tell me:

1) It is deep inside the bowels of the transmission or,
2) The part is no longer availible and I have to grovel in a junkyard
 

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Discussion Starter · #13 ·
I did a search on VSS related issues and I am seeing NONE of the issues others speak of
No fluttering speedometer
No ABS issues
 

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It’s the sensor on top of your rear differential
 
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Discussion Starter · #15 ·
I remember screwing around with this on my old Bronco, it was so rusted in place I just left it alone.....what you are describing is what I know to be the ABS sensor that counts teeth on a ring....Y/N?

So I found a vid that calls out a 94-00 F-150 (same as Bronco) and they show it to be on the side of the trans, I suppose this is wrong?
 

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95 f-150 4x4 5.8 e4od 05 F250 axles w/4:10's lifted/modded owned since 97 w/28K
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for the hard shifting, i think they nailed it with the above info.

ive got about 350k on my original e4od.

it has the factory trans cooler, and is deleted from the radiator, i put a trans go shift kit in around 75k along with a deep sump pan that held an additional 7quarts i think, its a derale with the cooling tubes running through it. it rarely sees temps of 150, ususally runs around the 140 temp sitting in traffic, in texas heat summer.
runs 120 when driving highway, i think ive seen it get to 170 one time when i was offroading in 4x4 at the beach, running it hard

still shifts like it did when it was new

ive owned the truck since 97 with 28k when i bought it and have always done fluid changes. i think when the fluid sheers down to a 4w (iirc) fluid, is when it NEEDS to be changed.
 

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Mine caught on fire once. It overheated in a mud hole and spewed oil onto the y pipes which at the time were cut with down spouts next to the trans. Years later on a long trip my rear brakes were locking up due to oil leaking from the wheel hub seal. I had to get home so I just stopped every time the trans light came on and let it cool down. About 6 times on a 10 hr trip. After all that she still runs like a champ. Recently she made a brrrrrup noise every time I punched it. Turned out it was overfilled a bit. Also had extra hard shifts during a psom fault. Replaced with one (the center section on dash) from the yard and back to running fine again. E4OD best transmission ever!!!
 

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My PSOM smoked when I was pulling my boat thru the mountains when my cheesy 3g alternator failed and the battery exploded. I saw a puff of smoke come out of the radio hole.
It then sat in a field for 12 years. It got hauled off and the towing company called me and asked if I wanted it back. I have put about 5k into getting it running right and the best 150$ I ever spend was getting the psom rebuilt. When I removed it, the processor chip fell off the board. All solder joints were dried up and the symptoms are endless and unpredictable. All old ones are bad or failing. No affiliation with the rebuilder. Its easier than checking the tone ring, waay cheaper than a transmission. The board is not conformal coated and the solder oxidizes and turns to dust.
 
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