My E40D started kicking in and out of gear in all forward gears a while back on my 1991 F150 4x4 300 six. Yest. it just stopped going forward but reverse is fine. It makes a sound like something not engaging when I put it in drive and makes a light engagement when I go to first. But it still will not move forward.

Now I for the life of me can not find one at a local you pull it type junk yard that is the same as mine.

The shifter linkage all seem different on the 93-95's I looked at as well as the transfer case's.

The junk yard that I went to said that 90-92 should work, however they didn't have one.

Can I swap one in from say a 93, change the shifter linkage to work with mine, and would I need to change my transfer case?

 

I discovered the transmission forum and posted there. Sorry for not noticing it sooner!

 

trust me you will soon get some good info on here too-just give them a few

 

Sounds like the MLPS sensor on the side of the transmission may be bad.

 

That's the one right there at the linkage right? I had no idea that could prevent it from going into gear. I pulled the drive shafts and placed it in drive a bit ago... I watched the output shaft on the transfer case spin away like it all worked fine. Put a load on it and poof not enough pressure to move the truck.

 

If the computer thinks it is out of gear or the engine is idling the computer will not give you enough oil pressure to move the truck. The two main sensors here are the TPS and the MLPS sensor. Either one will cause not enough oil pressure to move the truck.
You need to test both sensors.
Not saying this is your problem as it could be a lot of things but these are two you can check.

 

Yep, for the price I am just going to replace the MLPS. I replaced a faulty TPS when I bought the truck so I have no worries there but I will test it to be sure.

I did notice something else that seems to be baking in the back of my head.

When this all happened I noticed my fuel gauge not dropping back to Empty when I powered off the truck as well as my temp gauge not dropping. I just can't help but wonder if something like a bad ground or short could be giving me issues.

I got no codes out of the darn truck. Also it seems like my in dash volt gauge is reading higher now as well. I am only putting out about 15.9 volts to the battery but the gauge shows it on the L of [ NORMAL ] I have a Alternator tester with a built in battery tester, it all tested good. I swear it always stayed between R and M before.

That is all I can really think of. In all honesty I just don't have the money to rebuild the thing. Times are rough right now. But I do have a donor truck for a ZF swap if everything else absolutely fails...

 

The electrical does seem a little strange. If you want I can post the test for the MLPS with an ohm meter.
It is my bed time so I will be back on line in the morning.

 

That would be great! I would like to test it tomorrow.

I was out toying with a couple other things and noticed a slight engine miss. I did not have that miss prior to losing the transmission that I can recall.

Going to test that TPS for sure now and also hunt for other possible causes.

That electrical issue is really working on me now... I dig into it tomorrow.

Thanks for the info.

 

It sounds like you have a engine miss and that it the cause of the jumping in drive you felt a while back.

Now you have no forward engagement, nothing electrical can cause this, you can even unplug the transmission and it still should engage in forward and reverse. Forward and reverse engagements are selected with the manual valve in the trans, no solenoid or switch is involved with this.

Forward clutch failure is a real possibility, the clutches could be burnt or the teeth on the forward clutches could be stripped due to the engine miss. I have seen this on more than one occasion. When I build these transmissions I always use the diesel forward clutches in the forward drum, they have hardened splines to prevent them from stripping due to the diesel engine.

If you have reverse and no forward, full of fluid, your transmission has failed.

I would have it rebuilt, rather than go through the headache of trying to make one fit in the truck that wasn't made for it. There can be a number of things that could go wrong with the interchangeability of these transmissions.

 

Here is the tests anyway:
http://i54.photobucket.com/albums/g9...tionSensor.jpg

/

 

thanks for the link subford

 

Gets my vote.

 

It is vrey likely the problem is inside the transmission but just trying to cover a few things if is not.

Here is what the Ford Shop Manual says on the problem:

No drive in forward ranges.

Without overdrive canceled.

Possible Source(s):
Fluid level low.

Action(s) to Take:
Fill transmission to the proper level.

Possible Source(s):
Line pressure low.

Action(s) to Take:
Perform «line pressure test» . Refer to service procedure in this section if necessary.

Possible Source(s):
Manual linkage (internal and external).
-- Misadjusted, disconnected, damaged, broken or bent.

Action(s) to Take:
Service as required.

Possible Source(s):
Transmission pump inlet filter.

Action(s) to Take:
Replace filter if plugged, damaged or seal missing.

Possible Source(s):
Valve body and pump control body bolts not tightened to specification.
-- Dirty or sticky valves.

Action(s) to Take:
Retighten bolts to the «specification» listed at the back of this section. Determine source of contamination. Service as required.

Possible Source(s):
Forward clutch assembly.
-- Burnt or missing clutch plates.
-- Damaged seals or piston.
-- Forward clutch ball check assembly missing or damaged.
-- Center support damaged.
-- Holes blocked/feedbolt loose or missing.
-- Forward clutch ring gear damaged.

Action(s) to Take:
Determine source of contamination or damage. Service as required.

 

Well Odd enough as it may sound, the MLPS was bad - Replaced, and I drove the truck with zero trouble for about 75 miles today. I also fixed a miss and a broken ground. It shifts and drives better then it ever has since i owned it. (Although the shifts seem a little softer then what I am used to)

Thanks for all the info Subford.

I am still very worried about this transmission and it not having all the "Updates" With What JK080 has said I just want to know why it is working.. If that miss could have caused some damage. Hmm

Well I had a post in the transmission forums about a swap to a 5 speed. I have a donor truck out back with everything in it. If I have any trouble with the E40D again i think that's the route I will take.

JK080, why is it working now with the info you gave? Should I be planning on pulling that transmission pretty soon?