Thx for the heads up...will keep an eye on it from here on out. Let's hope the tranny gods will continue to look down favorably on the old girl...

 

Hard shifting problem has returned. Ran codes and turned up #628-Excessive converter clutch slippage. So, what am I looking at here for repair?

 

With enough reading you'll start finding info regarding the transmissiOn causing the hard shifting issue. There are a few things in the valve body that stick and cause erratic shifting.
My truck had only 25k on it when I got it 3 years ago. It shifted erratically quite frequently.
Very hard 1-2 shifts at moderate throttle and severe shifts 2-3 at low throttle.

When was the last time you replaced the trans fluid.

90% of my shifting issues were fixed when I flushed and replaced the fluid and filter on my truck (after another month of driving anyway)

First dump a can of seafoam in the trans. Then drive it 75 miles. Or 100 if you're not inpatient. Then follow filter/flush instruction found on the forum.
Replace with a quality fluid of your choice.

Read about the punisher valvebody and what problems it solves. I'm upgrading mine soon.

 

I agree with UNTAMND on this, Seafoam. Works wonders on just about everything internal. I think it is worth mentioning that my truck had shifted hard occasionally since I bought it at 123k miles, at 152k miles it had been doing it more frequently and I had began having some erratic fuel pump operation that I traced back to the engine computer. Upon replacement of the engine computer, I found my transmission shifted like a new unit. Just a thought if any other issues start to pop up. My engine computer was rather affordable, under 100$ I believe, and this was a remanufactured unit from Oreillys.

 

Does it randomly shift into neutral on you? if so you need to replace the MLPS on the trans
you can get them at the dealer.

 

No random shifts into neutral. Hards shifts are upshift only...downs shifts still pretty smooth.

 

I had problems with mine awhile back throwing the 628 code. Mine ended up being a bad solenoid

 

Were you getting the hard shifts?

 

start by inspecting the solenoid pack plug located behind a heat shield on the passenger side of the trans,about mid way.if you see any bare wires,replace this plug using heat shrink connections.should you need this repair (it will be obvious and its fairly common)
this will be what you need for example (though i don't know the quality of this particular one.its an example.)
http://www.ebay.com/itm/WIRE-HARNESS...sories&vxp=mtr

if the wires on the plug look ok,go ahead and carefully unclip it and slide it up and out.clean it up very good,and grease it.put it back in making sure it fully clicks.
next pull the main trans relay in the power distribution box (seek your owners manual for the location) clean and grease this as well.
also unbolt the pcm harness,pull,clean and grease this main clip too.it's located down under yor master cyl,but outward toward the fender.you'll see it.i think it's a 10 mm bolt.
with all these connections now cleaned and with a healthy dose of dialectic grease,clear the codes and go for a drive.

if the trans enters limp mode again,you will want to measure resistance of the tccs (Torque Converter Clutch Solenoid) to insure it hasn't failed.if so,you'll know you'll need a solenoid pack.if still that doesn't check out,make sure nothing else is causing the converter to remain open/unlocked such has faulty brake light circuitry.if still no go,there is a possibility your converter is in fact failing and needs to be replaced.if this is the case,you cannot delay!!! should the converter fully fail,it can come apart sending it's internals though your transmission which would then lead to a full trans rebuild rather than just a replacement converter.

this firm shift mode doesn't indicate a particular symptom,it's universal and it's actually your friend,even though it doesn't feel like it.
don't worry about this.the E40D will shift firmly whenever there is an electrical issue.this is increased line pressure to help protect itself as you limp her home or to a trusted trans shop (preferably if you have the means) for diagnoses and repair.it's simply a side effect to your true issue and will go away once the issue is resolved.

lastly,
it's strongly advised you consider your truck broken down right now until repaired.this advise can save you literally thousands of dollars.

 

I'd get hard shifts at times mainly in cold weather and that's also when it would throw the 628 code.

 

Thx, Diesel Junkie! Great post!

 

you betcha.
good luck! keep us posted on your findings, friend.

 

but of course nobody kept ANYONE posted on their findings because once again we come to a dead end post!!!

I HATE THIS CRAP!!!

CAN SOMEONE PLEASE START FINISHING THEIR POSTS ALREADY!!!

 

Look!!!!!
The new guy is upset......

Sorry, Had to


Well. A lot of us are extremely busy and the thread gets pushed way back in the archive.
Or
They just didn't try to do anything to fix the issue.

All you need to do in a situation like this is bump the topic back to the top with a quick comment like "hey I'm new here and was also wondering about the hard shift issue....has anyone found a solution"

I told you how I fixed mine (i think) somewhere in this thread. If not, listen close.

Buy can of seafoam and add bottle to trans
Drive 100-200 miles
Then
Drop trans pan and clean crap off the bottom and magnet.
Change filter and gasket (find a rubber gasket or use a hair bit of silicone on cork)
Replace pan and torque bolts (mostly critical with cork)
Overfill with new (cheap Walmart) fluid
Remove return line of trans cooler and add hose to end of it
Start truck and idle while it flushes old fluid out of trans internals (keep adding fluid while it's pumping)
Shut off truck when fluid is nice and pink
Replace cooler line
With running fill trans to correct level

Drive truck for 2 months and you'll notice things getting better
The servos and pistons and actuators of the e4od are temperamental.
Give it time to work its way loose with new clean fluid.
If in 2 months it's still shifting hard (these transmissions even new have a weird "lift off throttle" hard shift) then you probably need a new valvebody which we all reccomend the "punisher" valvebody. An fte friend custom builds these for us and gives a great deal.

 

How about loosing the CAPS key!!!!.

These E4OD's are completely computer controlled, if you have any DTC codes you need to fix them first.. Most codes will put the transmission in limp mode and it WILL shift hard.....