1999 ML320 Transmission DEAD - Mercedes-Benz Forum
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post #1 of 114 (permalink) Old 07-22-2011, 05:41 PM Thread Starter
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1999 ML320 Transmission DEAD

So, I lost 4th and 5th gear. Can still drive in 1st through 3, but slips above 3rd gear. So, I am trying to decide whether to replace the tranny or cut my losses. Interested in others experience. Here are the pluses and minuses.

Pluses-
1) The ML has been very well maintained. It is very clean inside and out.
2) New tires, new brakes.
3) Overall been pretty happy with the vehicle

Negatives
1) 155k
2) Needs ball joints and tranny = $5k
3) Fuel gauge does not work right.

I am wondering if $5k into this car is a good idea. thoughts?
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post #2 of 114 (permalink) Old 07-22-2011, 07:16 PM
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5k is a tough pill to swallow on a 99 with 155k. Id maybe try to track down a used tranny. 3500 or 4k may be my limit on that truck. Unless you have a lot into it. Your financial situation is also a factor. If your pretty well off and can swing another used ride, maybe your better off getting rid of it. You can probably grab a 99 320 with half the miles for a couple grand more.
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post #3 of 114 (permalink) Old 07-23-2011, 09:01 AM
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if you have the time to part it out and sell item individually you might make good money. and if you get another ML use your old one for parts...

O tempora, o mores
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post #4 of 114 (permalink) Old 07-23-2011, 09:06 AM
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Have you gotten a definitive diagnosis that the trans is shot?

Mercedes Benz - Das beste oder nichts!
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post #5 of 114 (permalink) Old 07-23-2011, 09:46 PM Thread Starter
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I have thought about parting it out. Kind of a PITA, but might be worth it. It is basically worthless right now, but has lots of good parts. Don't have the room to get a parts car, or use this as one.

Re DX: The trans was slipping so I took it in to have it flushed with the hope that it would come back. It is actually worse now. Drivable up through 3rd, which gets you to about 45ish. Freeway is not possible. Soon as it shifts into 4th the engine revs and no power transfer to the wheels. My mechanic told me the trans is a gonner. I don't know if I trust him 100%, but it looks dead to me. Went fast too, started shifting a little hard, nothing big, a small slip here and there about 2 weeks ago. Probably put less than 20 miles on it from when symptoms started. Suprised by that. i had a 1990 E300D that shifted hard for almost 300k miles, transmission never died.

In any case, what else could it be. I am assuming that my mechanic filled up the trans fluid properly.
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post #6 of 114 (permalink) Old 07-23-2011, 10:13 PM
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Did he use the correct dipstick for a 722.6 transmission?

Did he scan it for transmission fault codes with a pro grade scan tool like the Snap-On Solus?

I have seen them have bad symptoms and it was an electronic issue. The trans hardware
was fine in these cases. Solenoids failed or the conductor plate went bad. Once fixed the
vehicle drove just fine.
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post #7 of 114 (permalink) Old 07-23-2011, 10:17 PM Thread Starter
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I am not 100% sure. He is a mercedes specialist and in talking with him he sounds like he knows what he is doing, but I will give him a call on monday and ask. Is there any reasonable way to check the solenoid or conductor plate. Is it worth an eval at the stealer?
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post #8 of 114 (permalink) Old 07-23-2011, 10:27 PM Thread Starter
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Would absolutely love it if it was the solenoid or conductor plate. How hard are these to replace? Looks like the quote has a "AT electronic contoller unit" for $245. Seems to me that is pretty cheap and likely can be found cheaper. Might be worth just buying one and putting it on, if it does not work it can be moved to the new tranny.
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post #9 of 114 (permalink) Old 07-24-2011, 02:29 AM
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Actually a scan of codes can tell a lot. If it is a solenoid it will pinpoint which one.
If there are lot of electronic codes stored then it is most likely the conductor plate.
It needs to done on a lift and experience with this trans is strongly suggested.

Yes it can be moved to a new trans.
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post #10 of 114 (permalink) Old 07-24-2011, 05:12 AM
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The first thing that should be done is have the codes read and documented with a professional grade scanner as previously suggested.

Then separate the 13 pin connector on the right side of the transmission and see if there is trans. fluid present. If so, the electrical connector must be replaced and then the codes must be cleared both in the Eng. Control Module and the Trans.Control Module.

The 722.6 trans. has three shift solenoids (see pdf.), 1-2 & 4-5, 2-3, and 3-4. If 1-2 is not a problem, then it should be assumed that 4-5 will also be fine since the same solenoid is used. So if any solenoid is faulty, then it should be the 3-4 one, but the codes will tell you for sure.
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