Had my 4R70W rebuilt, converter won't stay locked up, and nothing is fixing it! - TCCoA Forums
 
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post #1 of 18 (permalink) Old 08-09-2007, 08:37 PM Thread Starter
 
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Question Had my 4R70W rebuilt, converter won't stay locked up, and nothing is fixing it!

I have a '95 Mark VIII with 80k miles. 2 months ago, the intermediate one-way clutch crapped out and I lost second gear. I took it to a local transmission shop that has a good reputation, has been around for a long time, and is a member of the Automatic Transmission Rebuilders' Association. They quoted $2300 for a rebuild, with a 12k-mile/1-yr warranty backed by ATRA. According to my invoice, the job included a "master rebuild kit", intermediate OWC, valve body, shift solenoids, and torque converter.

When I got it back, it shifted perfectly and felt great. However, the torque converter clutch hasn't worked right ever since. When I accelerate to 45 mph or so, it goes into lockup as usual. Then 5-10 seconds later, it unlocks for no apparent reason. It then stays unlocked until I come to a stop and go through the gears again. After 10 or so drive cycles, it eventually stops even attempting to lock the converter. At that point the PCM sets code 628 - "excessive torque converter clutch slippage". If I disconnect the battery to clear the memory, the whole cycle starts over again. I've tried it with O/D on and off, it does the same thing either way.

If I keep it at a steady 35 mph (just after it goes into 4th and locks the TC) and barely touch the gas, it'll stay locked up almost indefinitely. But as soon as I accelerate or go up the slightest hill, it unlocks and stays that way.

I took it back to the garage. The mechanic diagnosed it using a "Shaffer Shifter", which plugs into the harness and takes control of the transmission. He took me for a ride to demonstrate that it had no problems staying in lockup under manual control, and that there was no noticeable slippage.

Based on that, he said that it had to be something outside of the transmission. Which seemed like quite a coincidence, but you never know. Anyway, to make a VERY long story short, here's what has been done so far:

-PCM replaced with a OEM unit rebuilt by Cardone (same model #, same calibration code).

-The replacement PCM did the same thing but did not set any codes, so it was replaced. Didn't solve the problem, but it's back to setting code 628.

-Checked all wiring from the transmission harness to the PCM and tested the TCC solenoid.

-New Motorcraft TPS

-New Motorcraft output shaft speed sensor

...At this point, the shop began talking to a technician at ATRA. Based on his info, they went on to replace...

-Coolant temp sensor

-MAF sensor

-MLPS

...And after pretty much everything outside of the tranny was ruled out...

-Torque converter

-TC bypass clutch control valve/sleeve

Not one of these things has made the slightest bit of difference. As of today, they're pretty much out of ideas and are waiting to hear back from the ATRA guy on what to do next.

On one hand, the shop has been reasonable. They aren't trying to BS me or weasel out of fixing it, they acknowledge there's a problem, and they haven't tried to charge me another dime for anything. They wouldn't cover the PCM/MAF/TPS, but they had no problems with me buying the parts and installing them myself. And they're still trying to fix it. So I really can't justify any nasty letters or lawsuit threats.

But then again, I paid them a lot of money to make my transmission work properly. I spent more time and money replacing parts based on their advice, without any resolution. It's been TWO MONTHS and counting, I still have a broken tranny, and I want my damn car back!!

So if anyone has any ideas or advice on what to do next, I would really appreciate it.
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post #2 of 18 (permalink) Old 08-09-2007, 11:35 PM
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Did you try replacing the converter? Could be a problem in there. I think you have ruled out just about everything else it has to be in the valvebody or converter. It's possible that it is the od band slipping not the converter. By now taking it apart should show the problem.
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post #3 of 18 (permalink) Old 08-09-2007, 11:51 PM
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2300 is a bit high for a rebuild that did not use the Mechanical Diode OWC, considering, the intermediate was replaced platform wide quite a few years back as the proper OWC spec'd by Ford.




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post #4 of 18 (permalink) Old 08-10-2007, 02:07 AM
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2300 did they include lube on the estimate sheet?!
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post #5 of 18 (permalink) Old 08-10-2007, 07:47 AM Thread Starter
 
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They did use the mechanical diode, and yes the torque converter was also replaced a second time.

I thought about the OD band slipping, but it also does the same thing if I turn OD off.
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post #6 of 18 (permalink) Old 08-10-2007, 08:29 AM
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if they can hold it locked up with their tool, it would seem that it would be some kind of electrical problem to me. like maybe they used a newer tranny and didnt wire it correctly or something.
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post #7 of 18 (permalink) Old 08-10-2007, 11:43 AM
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Or maybe the computer is detecting excessive slippage and unlocking it?

I am wondering about the condition of the direct clutch seals. Or maybe the torque converter pressure regulator valve in the VB. Heck, it could be a lot of stuff really.

Too bad you don't have someone that really knows about this stuff and how to test all of it near you.

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post #8 of 18 (permalink) Old 08-26-2007, 08:46 AM
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what code is it setiing a p0628? i cant seem to find that code in my dtc index, and i found it in a gm OBDII dtc quick index and its saying its a fuel pump relay circut code

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post #9 of 18 (permalink) Old 08-26-2007, 11:45 AM
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Little too late, but instead of rebuilding a boat anchor for 2300, you should have just called a junkyard, and gotten a late model stang transmission for 400 bucks or whatever.

I just put a 40k mile 98 mark8 trans into my tbird for 300 bucks.
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post #10 of 18 (permalink) Old 08-26-2007, 01:23 PM
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i to would have not payed 2300 dollars for a transmission build, but at the same time, the junkyard unit will tend not to have any garuntees on if it will work properly

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post #11 of 18 (permalink) Old 08-27-2007, 08:21 AM
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Quote:
Originally Posted by JoeyICU View Post
i to would have not payed 2300 dollars for a transmission build, but at the same time, the junkyard unit will tend not to have any garuntees on if it will work properly
False, that depends who you deal with.

Any reputable salvage yard will put a warranty on everything they sell. I have six months unlimited mileage.
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post #12 of 18 (permalink) Old 08-27-2007, 04:40 PM
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i said garuntee's, not that it wouldnt have a warrenty, garuntee meaning you are unsure of the history of the unit so you always have that potential fr a premature failure, where as rebuilding the unit, you know it is new, and usually it will function properly for a long while

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post #13 of 18 (permalink) Old 08-27-2007, 06:43 PM
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Quote:
Originally Posted by JoeyICU View Post
i said garuntee's, not that it wouldnt have a warrenty, garuntee meaning you are unsure of the history of the unit so you always have that potential fr a premature failure, where as rebuilding the unit, you know it is new, and usually it will function properly for a long while


I always worry when i get a major automotive component from a junkyard. Luckily I have never had a bad experience yet.

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post #14 of 18 (permalink) Old 08-28-2007, 10:06 PM
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Quote:
Originally Posted by JustinH View Post
False, that depends who you deal with.

Any reputable salvage yard will put a warranty on everything they sell. I have six months unlimited mileage.
Just don't mention you will be replacing parts to make it fit your bird/cougar; The place I bought mine wouldn't warranty a GM tranny in a Cougar.

When you buy used parts, tell them you have whatever it comes off of.

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post #15 of 18 (permalink) Old 09-01-2007, 08:07 PM
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i cant say i have ever heard of gm having there own 4r70w

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post #16 of 18 (permalink) Old 09-01-2007, 10:02 PM
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post #17 of 18 (permalink) Old 09-01-2007, 10:22 PM
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o god im slow, my bad

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post #18 of 18 (permalink) Old 09-02-2007, 12:34 AM
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You might think this is a silly question, but, do you have led tail light, brake light bulbs?

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