A 604 tranny problem !!

[lookin]

Quote:

Originally Posted by c2xejk It won't put the trans in limp home mode right away. It will cause problems in the longer term. From what has been described here, I don't not believe the Dex3 is the immediate problem (it still needs to be replaced.)

Couldn't it though depending on what kind of shape it is in? Dexron III cleans like crazy, and if the trans was dirty enough the SVB could be all gummed up now.

Yer prolly right though.

On edit:

Or maybe not.

Because it was just a top-off of Dexron 3, I still suspect that it's solvent properties dislodge some gunk, and your Solenoid Valve Body is now clogged up. A complete fill of Dexron 3, most definitely can however, put even a clean well maintained A604 quickly into limp mode.

[carzboyz]

But what should I do to clean my selenoid valve body ?? It can be removed ? how ?

[lookin]

It can be done I hear. I would not try it though. They are fragile, easily broken.

He may be right that your wiring is just wrong. Though you still should get that Dexron out of there.

Did the trans work at all after the transplant?

[c2xejk]

As I recall, the owners manual for my '91 does say "topping off" with dexron ?? is acceptable...

Unless I miss understand the events that occured, the dexron 3 a non-issue.

The events as I understood them.

-A604 was removed from donor car (trans was shifting fine.)
-A604 was installed in it's new home.
-A604 never shifted while in it's new home...

Given that one wiring issue has already been found, I would be looking for another wiring issue.

[lookin]

Quote:

Originally Posted by c2xejk As I recall, the owners manual for my '91 does say "topping off" with dexron ?? is acceptable... Unless I miss understand the events that occured, the dexron 3 a non-issue.

They made a mistake though, and it is well known that Dexron is death for an A604.

The following is from Allpar.

Quote:

Originally Posted by ALLPAR When you change your transmission fluid, always use the recommended (in the manual) fluid. (1989-91 owners, ignore the manual and use ATF+3). Dexron is not a universal fluid. Chrysler four-speed automatics only use ATF+3 (ATF+4 for newer vehicles), regardless of what the dipstick or owner's manual says. To quote Mopar Magazine, “ATF+4 is the right fluid for Chrysler automatic transmissions built since 2001.” Do not use Dexron with an additive. Richard Widman passed us an extensive report from reputable gas company Chevron, which compared ATF+3 fluid with Dexron plus various additives. They found that neither of two major brands matched ATF+3's performance specs.

Quote:

Originally Posted by c2xejk The events as I understood them. -A604 was removed from donor car (trans was shifting fine.) -A604 was installed in it's new home. -A604 never shifted while in it's new home... Given that one wiring issue has already been found, I would be looking for another wiring issue.

Maybe the issue is the Dexron added though. Very likely really since the wiring issue has been found. As you say, the trans worked fine, but then Dexron was added, and so there it is.

My theory:

If the trans is dirty, the Dexron top-off may have knocked some crud loose, that clogged the SVB. Dexron is way more solvent than ATF3 & 4.

A full Dexron fill will send any a604 into limp mode, and a top off on a dirty a604 will also, for the reasons stated above.

[carzboyz]

Before to make a ride with the car I refulled the transmission because it loose some fluid during the transplant. I putted 3 quarter of dextron 3 in the transmisson and I decide to make a ride and the trans never work since then. I checked my wirring and everything EVERYTHING is correctly plugged and everything was working great before the transplant.

[lookin]

Quote:

Originally Posted by carzboyz Before to make a ride with the car I refulled the transmission because it loose some fluid during the transplant. I putted 3 quarter of dextron 3 in the transmisson and I decide to make a ride and the trans never work since then. I checked my wirring and everything EVERYTHING is correctly plugged and everything was working great before the transplant.

Did you mean 3 quarts or 3/4 of a quart? Either way, to be safe, see below.

OK carzboyz ... now don't panic.

You just need to, not just drain the filter pan, but flush all the trans fluid out, put in a new panel filter ... and then refill with the correct fluid of either ATF 3 or 4.

Chances are it will be OK.

[EvilcowRoland]

Dexron 3 is the same base as ATF+ whatever, minus the chemical additives Chrysler puts in. Without their specific additive your trans will eventually tear itself apart. But adding 3/4 of a quart or even 3 quarts will not immediately cause it to break (more likely it would be slipping). If you've only driven it a little then you're still okay. Just take it to a shop and have them flush it. MAKE SURE they put in ATF+4 (or ATF+3 if that's all they have). Your non-shift issue is most likely electronic. Double check your wires and make sure nothing got nicked when putting the trans in. Make sure your ground strap to the trans is attached properly. Also, the input and output speed sensors on the front of the trans are notorious for going bad. Try swapping them and see if your limp condition goes away.

Just a side note, a couple of years of TSMs had bad control code. I think Allpar had an article on it, but when you get it shifting again you may want to take it to a Dodge dealer and get the TCM flashed with the better programming. I don't know if they charge for that or not since it was in a TSB, but if your car wasn't originally a V6 auto then they may not do it. Check with a guy on here name NAJ. He would probably know.

[lookin]

ATF+3 is not just Dexron with special Chrysler additives.

That is the basis of the old "you can use Dexron with Lubeguard to make an ATF+3 equivalent" myth. It is not merely a matter of Dexron being a "slipperier" fluid that causes slipping either.

Dexron compresses more easily (or less easily I forget which) than ATF+3 or +4, and the additives used by Chrysler, not only modify frictional characteristics, they also modify the solvency characteristics of Dexron.

Carzboyz may have missed a ground or a connection. That is true. Over the years however, many many A604 owners were run around from shop to shop, trying to find non existent electrical problems when Dexron was the real cause. The problems caused by Dexron, can range from torque converter shudder and hard shifts, to putting an A604 right into limp mode.

So Carzboyz, by all means double check all of your electrical connections, and make certain you have a good ground. Then change the filter and flush all the old fluid out. Then refill with ATF+3 or ATF +4.

[carzboyz]

Where is the ground you talking about ? I never see a terminal with a srew on the transmission I saw 3 grounds with terminal and I fxed it to the body. 1 on the firewall and engine the other in the right fender and the other one on the left fender

[carzboyz]

Ok I completely drain the transmission and the torque converter and I replace the oil for penzoil atf. I changed the filter. The filter is a mopar one. I disconnect the batery for 1 hour I made a ride and the problem is alway there !! ****ing A604

[lookin]

Carzboyz

This should help you check and repair A604 electrical connections. I am trying to find you a wiring diagram.

don't panic

Rob's Corner A604 Intermittent limp mode

Rob's Corner A604 Computer & Sensor Locations

[lookin]

Check your PMs Carzboyz.

I sent you the diagram, and more.

[carzboyz]

I found the problem I have no power to the TCM and the 2 relays don't have power to be activate. Thanks you PS thanks you for the wiring diagram

[lookin]

Quote:

Originally Posted by carzboyz I found the problem I have no power to the TCM and the 2 relays don't have power to be activate. Thanks you PS thanks you for the wiring diagram

Great!

You're welcome. It took me 2 hours to find them. I felt I had to help out though. Since I was wrong about it being the Dexron and all. cough