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Discussion Starter #1
I'll try to stick just to the important stuff to make this as short a read as possible. '97 E40D with about 120 on a stock type rebuild/update. Truck has been babied and trans always shifted smooth and solid. Last weekend we hauled our horse trailer an hour away and everything was fine. When we went to leave some hours later I put it in reverse and the TC was completely locked up...killed the engine. Did that every time I put it in reverse about 10 times in a row unless I stayed off the brake and gave it some right pedal.

Got 15 minutes back toward home, stopped for fuel, and noticed a puddle under the bellhousing. Started it, checked fluid level and it was fine. Looked under the truck and had a steady stream running out of the bellhousing so I shut it off and called a wrecker.

By the time the wrecker got there, I went to back the truck up and the TC acted normal with no fluid running out.

Next day I took the truck for a test drive, and everything seemed fine for the most part. Worked the tranny pretty hard and got it up to 185deg. Got home and put my hand on the cooler...it was cold. Bypassed the stock cooler, blew out the aftermarket cooler, hooked the lines up and felt heat immediately after starting the engine.

I was in the driveway messing with the truck put it in park for a few minutes while I pondered the situation, went to put it in reverse...nothing. Put it in drive...nothing. Shut it off, restarted it, had drive and reverse back. Put it in park for a minute...no drive or reverse.

This morning I decided to take the truck out to see what it would do on the road. I had no converter lockup (torque app showed 0 on slip, but I hadn't looked at that before so I don't know if it was working or not).

Got farther down the road and went up a big hill. More and more slipping, until I got to the top of the hill, stopped, went to pull out and had nothing. Shut it off, restarted, and I was moving again.

At this point I could go 200 yards and have nearly no trans, shut it off, and it did alright minus the TC until the next 200 yards. I limped home, shut it off, got in my '95, and went to work.

BTW, it wasn't until this morning that I got a P1728 code.

Anyone have any thoughts? I'm thinking rebuild time, but I want to try and pinpoint any issues before the trans gets pulled.

Thanks,
Phillip
 

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Discussion Starter #2
I'm thinking the pump went out. I think low pressure can cause a TC lockup in reverse. I think low pressure can also cause the TC and clutches to not fully engage thereby overheating the tranny and causing it to spew fluid out the front pump seal. I think maybe when I unblocked the cooler there was even less pressure on the system and that's why I'm not getting hardly any clutch or TC engagement once I get the tranny to operating temperature.

Am I on the right path, or am I way off?

Also, there is a faint "bad bearing" sound coming from the front of the trans when it's in park.

Thanks,
Phillip
 

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You mentioned losing trans fluid, but didn't say if you replaced what's lost. Low trans fluid will cause all of the symptoms that you have.
 

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Discussion Starter #4
When the fluid first leaked, I checked and it was all the way up on the hot mark on the dipstick. Checked it again last night at about 100deg trans temp and it was halfway up on the hot mark.

Thanks,
Phillip
 

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Discussion Starter #5
Thought I'd let everyone know what I found. The TC is completely junked.

-Phillip
 
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