O.K., I've read & replied to some posts about hard 1-2 shifts in the E4OD. Finally, I'm confronting the problem 1st hand, well 2nd( my buddy's truck-95 F150 4x4). I've heard & read where it can be the manual selector, TPS, valve body, poorly op. engine, etc. If any of you have found the answer, please let me know. I've rebuilt several C series trannies, and a couple AODs , but no electronics, yet. So as for now, I'm gonna go with my gut and clean & inspect the valve body, and look into a shift improver kit( a Baumann's , check out their site for in depth quality kits).After some road and pressure checks, of course. Tell me what you think, & I'll tell ya what I find. Thanx in adv.

 

I had some shifting problems , mostly hard shifting and delayed shifting. I went through a lot of trouble to find out it was the TPS. A friend showed up with a computer. I could not believe it at first but realized the E4OD is computer controled. I figured that because the idle was fine, the TPS was also fine. When the TPS went bad on my buick, the idle was racing and would not come down.

 

I have that exact same truck with that exact same transmission with that exact same problem, and I have been waiting for the answer to that exact same question. I have posted on another board about it but I still don't have a 100% solution. On top of the tranny prob I also have a speedometer that bounces around, and an O/D button that won't work. The speedo is my first priority to fix because I think it may be contributing to the tranny probly. I replaced the VSS but it didn't help. I had planned on taking the rear diff cover off to check out the condition of the VSS sensor ring, but it rained all weekend (wish I had a Garage). Another post said the rooster comb was bent, and that fixed the prob after it was straightened. I have rebuilt a couple C-4s and AODs, but I am not in a hurry to rip this tranny out yet and go through it until I am sure that is what needs to be done. I think I will take a look at the TPS, but I'm pretty sure mine is fine. Also I get a code 628 whenever the tranny acts up (Excessive TC Slippage) but as soon as I clear it the tranny shifts right as long as I stay around town, but as soon as I get above 50mph it will start shifting hard again after a while. No other codes come up. Any info that you figure out would be greatly appreciated.

 

Dump your computer codes. The E4OD is controlled my the PCM. I had the hard 1-2 shift problem and the root cause turned out to be a slipping torque converter lockup clutch. Here is what happens. The clutch slippage is detected by the computer. The computer commands the pressure regulator solenoid to raise the internal hydraulic pressure in order to stop the clutch slippage and the exta high pressure causes extremely hard shifts.

Code 628 tells the story. If you clear the codes by disconnecting the battery, the pressure is reset to factory default. When slippage is detected again, usually above 45 mph, the problem returns.

Anyone with experience working on non-computer transmissions can easily be fooled by these beasts. Replacing sensors and switches without knowing the root cause is expensive and frustrating.

Jim

 

So are you saying to replace the TC??? I understand why it is shifting hard, I just want to know what is causeing it to shift hard. My theory on the slippage is because above 45 my speedo is jumping around 5 mpg or more to either side of the actual speed. If the tranny gets a speed signal that tells it to lock up, the suddenly the speed drops by 5mpg it will unlock. Do this about 30 times a minute and the computer will think the TC isn't staying engaged properly. Personally I like the harder shift, but I don't like the reason it is happening. I would rather it shift harder because I put a shift kit or FTVB in it. But before I do that I want to know whay it is doing it now.

 

Check both of the accumulator valve springs in the accumulator valve body. More than likely you have a broken 2nd gear accumulator spring. This was the problem that I found with my 90 F250 with the E4OD. I replaced the spring and solved the problem. And it only cost a few dollars for the spring and more trans fluid.

 

always look first at the TPS

 

Wouldn't a broken Accumulator Spring cause the tranny to shift hard all the time??? Like I said my prob goes away after I clear the codes from the ECU and doesn't come back until I drive for a while over like 45-50. Funny thing is for the past couple days it has been shifting hard, but since I haven't driven over 45 for the last few days I think the code clered itselt and it is shifting soft again. Still haven't goten to the TPS yet, but I plan on doing a complete tune up on it this weekend.

 

Dump the codes. Do not replace a TPS, VSS or MLPS unless necessary. There are multiple possibilities for this problem.

Jim

 

I have the same problem as you know. After reading all this I am thinking about taking my truck to the Ford dealership and let them have a look at it.

Mine doesn't slam shift all the time, but when it does it gives me a good jolt.

 

Try reading thru this:


http://www.baumannengineering.com/e4odinf.htm

 

Read that before, but read it through again just in case I missed something. All fine and good, but I have a 95 so all the updates should be done. And no answers as to what causes the hard shift.

 

Folks,

I had a bad TPS code, so I swapped it out, and CREATED the problem you describe! The throttle is definately more responsive, but my truck shifts early and very very hard. 95 Bronco, 5.0, AOD...

Your thoughts?

 

From what I can find the sensor in the rear end is not the VSS. I asked for the VSS at Autozone it was a sensor that goes in the transfer case and the speedo cable attaches to it, if equipped. I got the other sensor from Ford but didn't get it's name. My guess is the VSS is the cause of the bunceing speedo. I am wondering if the sensor in the rearend has anything to do with the trans or if it is just for the ABS.

 

TO take some of the mud out of this water (mud that I added), My brand spanking new Carquest TPS sensor was bad. Picked up another from Advance Auto (cheaper by the way), truck runs and drives perfectly. Thanks for your help!