First of all thank for letting me on the site, I'm sure I'll find some great here, and hopefully I can help out a little too.

Anyway, here's my problem. I did some hauling with my old man's f150 I parked it for the night, and the next morning it had no reverse. it did shift into drive, but only when you idled the engine up to about 1000 RPM. When it did finaly shift into drive it shifted hard(as in "bang" hard). There was also a noise in reverse that I can best describe as jingling.

So! Dad went out and found a trans to put into the truck from a salvage yard he brought it over, and we stuffed it in. Yesterday we got it going, and now we have the same problem as with the other transmission, no reverse, and hard shift into drive. The exception is there is no sound in reverse. I've checked the following:
fluid level is good
linkage is adjusted properly
all wiring is connected and routed properly

I have trouble believing that the 2 transmissions we have both happen to have the same problem, so that leads me to something wrong with the truck. I'm fresh out of ideas, and any help getting this truck out of my garage ould be HOT!

The trucks vitals are 93 f150, 5.0, E4OD trans.

Thanks in advance
Bob

 

Sounds like low oil pressure in both Transmissions.

May be from different reasons but would give the same symptoms.
Worn out seals, bad pump, clogged filter, broken spring.

 

If it's electronically controlled, would it help to pull the codes?

 

When looking at no Reverse or Delayed Engagement there are no Electrical Routines only Mechanical/Hydraulic.

 

His first step would be to put an oil pressure gauge on it.

 

Did you reuse the torque converter from the old transmission?

 

What he asked. A burnt converter will do this.

 

Messed up converter output not engaging the pump?

 

My truck was doing the same thing. When the temps around here got up above freezing, everything works fine now, for the most part.

I was told by an experienced shop owner nearby to replace the Range position sensor (Its mounted behind the shift arm on the driver side of the tranny. If this isn't working properly, then the computer will not know how high to make the line pressure.

Same deal goes with the TPS (Throttle position sensor.) If there is a dead spot in the sensor, then like mentioned earlier, the computer will not know how to make the line pressure in the tranny. Also might want to check the VSS (Vehicle speed sensor) on the rear pumpkin.

Do me a favor first. Take the plug off of the VSS (its on the front side of the pumpkin, above the driveshaft.) Take it for a drive and come back home and plug it back in. Thats what allowed mine to work again, because it will put the transmission into "Fail Safe" mode.

 

This is an oddball question...10,000 to 1 odds against, but...Is the Dome light and digital odometer working OK??? If you accidentally bang on the top of the cab ( or lean something heavy on the cab roof) the dome light fuse has been known to blow, the screws in the dome light are too close to the metal roof and cause a short circuit. This kills more than the dome light circuit, it kills a critical circuit and you end up with a truck with hard shifting, but I'll admit it never totally stopped reverse gear from engaging.
There is also a sensor on the side of the tranny that is known to cause oddball problems, it is the manual shift lever position sensor. It tells the computer what gear you are trying to go to.

 

wow thanks fo all the replies. In answer to some of the replies. I don't have an oil pressrue gage to check it with, this is my first rea foray into auto trans.

I did not re-use the tourque converter but I did check out the splines and replaced the front pump seal before I pu the converter in. the converter is also mated up all the way in the input shaft.

I will try the VSS, and the shift sensor to see if they work.

thanks to everyone. any other suggestions would be greatly appreciated too.
bob

 

The bottom line is that there is nothing electrical that will stop it from going into reverse. That is why I suggested the oil pressure gauge, you should be able to rent or borrow one from an Auto Parts Store. It is also the first step in the manual for your problem.

 

My tranny wouldn't go into reverse when I had that problem... Now it works fine...

 

I had a problem like this, but it was in a [forbidden word].

I'm not sure if it helps in anyway, but in that case the modulator had broken off, and was not allowing the fluid to build pressure properly by aera...arae...getting bubbles...

Do the E40D's have a way this can occur?

PS...I like the Name! It reminds me of me!

 

I was thinking this could be a MLPS problem since it happened on both transmissions, but I don't know much about automatics...