i disconnected the RABS module, where is the cruise control module at?

 

Check your ECM.
Click this link:A9x ECM's (and same years ECM's) Failures Due to Age

If your ECM is bad, your computer controlled transmission will shift bad.

Good Luck,

Bob

 

so the ECM will cause it to shift bad?
it goes into first and hardshifts to second and then hits 3rd for a sec and then straight to 4th. even with o/d off it still goes into 4th.
i can feel it shift but it is not shifting correct at all. it wont kick into passing gear without shifting very violently.

 

You may just be feeling the torque converter locking up. Don't even think about the ECU yet. You need to fix your speedometer problem before anything else.

The cruise control module is on the drivers side fender, you will see a throttle cable going to it.

 

i wiggled a connector behind the speedometer and it fixed that problem, but its still not shifting right. the speedometer doesn't jump at all now. i was relieved to fix that problem.

 

Reset the computer by disconnecting your battery for a few minutes.

 

i did that and took it for a drive and it is still doing the same thing.
so do all things point towards the ecm?

 

It could still be the Speed Control Module. Try unplugging it before removing the PCM Computer.


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i unplugged that as well and it is still doing the same thing.
are there any other relays or modules that go to the transmission?

 

No the PSOM is the last module that feeds the PCM Computer the speed information.
The PSOM is located on the back of the cluster and the odometer and the speedometer plug into it. It receives the speed information from the VSS on the rear end, converts it and sends the information on to the speed control module and the PCM computer.

The PSOM:


The VSS/PSOM diagram:\


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soi need to remove that and buy a new one?
is it an easy thing to remove?

 

Pull yours out, it's located on the back of the instrument cluster then inspect it for signs of burn marks or dried up capacitors. I doubt you will find a new one, you will need to source one from a salvage yard if it turns out yours is faulty.

 

I did not say you had to remove the PSOM. I was just answering your question if there were any other modules or relays before the PCM computer that controls the E4OD Transmission.

You more than likely have a bad PCM or wiring to it or to the E4OD from the PCM.

The PSOM module can fail in a way to do this but this is not the way they fail most of the time. Most of the time they have a loose component on the PSOM board or a burned up chip or bad connection. Most of the time when they fail they will cause the speedometer needle to bounce or no output at all to the Odometer, Speedometer, Speed Control and the PCM Computer.

To replace a PSOM you would need to go to a salvage yard and get a cluster out of a 1992-1996 F or E series truck and take the cluster apart and replace your PSOM with the PSOM out of the other cluster. Note you will then have to program the PSOM to your tire size if the stored tire tire size is different than yours. Also you will now have the mileage of the truck the PSOM was removed from.

PSOM location, you have to take it out the front along with the Speedometer head and then take the PSOM off the back of the Speedometer head:


Remove the three screws below from the PSOM board and the Odometer ribbon cable and the the PSOM will pull off the four pins of the Speedometer head:

 

And here is a way to visually check your PCM:
Click this link:
A9x ECM's (and same years ECM's) Failures Due to Age

If you see the obvious "capacitor leakage" thing happening, you better well bet your PCM is in need of repair or replacement and isn't functioning correctly.
I've done the "capacitor replacement" on my PCM and it still doesn't work correctly.

Visual checks cost nothing but a little time, and can answer a HECK of a lot of questions.

Most importantly remember, this is only a visual inspection and repair (if you dare) and doesn't guarantee either way that the PCM is or will be functioning correctly.

Just my .02 cents

Good Luck.

Bob

 

I checked the PSOM visually and found no signs of any problems. everything looked really good. Then i checked my PCM and it looked perfect. but it had no electrical compacitors in it like were showed in the picture that was posted. I bought a PCM out of a 93 f150 with the same motor and trans and it had 3 electrical compacitors. is there a diffference in the compacitors and such in a 94 PCM than in anyother one?
im still dead in the water, its still having problems and i dont know whats causing it. i took it for a drive down a 2mile mile road and held a constant speed and throttle and the truck was constantly shifting between 3rd and 4th. whats causing that?