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@mysclass on Instagram 2000 S500 (sold) 2001 S430 on AMG Rims with Brabus Bumpers Lorinser side
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Discussion Starter #1 (Edited)
Hey Benzworld, haven't posted on here in a while, recently I have been experiencing trans problems where on hard acceleration it will shift smooth first, second, third, fourth, fifth downshift smooth to fourth then into third it is a real harsh clunk and it slips completely out of gear as if I was in neutral. Will not go back into gear until I am either around 40mph where it will go into first or I have to come to a complete stop then I can accelerate again. I started experiencing this problem 3 weeks ago I floored it engine running at 80 degrees get into 4th and let off then it downshifted and did what I explained above. The problem did not occur again until 9 days ago December first, and it has happened 5 times in the past 9 days. I can drive regular and it will up shift and downshift smoothly to any gear
[Note: happens if I use the downshift button or not. Previous owner claims that he put new trans fluid 5000 miles prior to me purchasing the vehicle, I have put 18k on it.)

The vehicle is a 2001 S430 with 246xxx miles

I have come to the conclusion that I am going to replace my conductor plate, valve body, electrical connector, and of course put new trans fluid and hope for the best.
Let me know what you guys think my problem is, I would love to hear about if you have had a experience similar to what I am experiencing with this trans
As far as I know it is the original transmission
 

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W220 Moderator
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Hi,

Save your time and money, put those new parts into a good used transmission and fit that, the fault you describe is most likely an internal Clutch or Sprag issue ;)

HTH,
 

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2005 S600
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How did you come to this conclusion?

Any time, and I mean any time, that you have a transmission problem, the first thing to do is to check the fluid level. You know that the fluid was changed, but you have no idea if it was done properly. It needs to be checked/adjusted on a dead-level surface and the level measured vs. the fluid temp. SDS or an IR gun are required.

Read up. Check that. Then proceed.
 

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W220 Moderator
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I do agree, of course the level should be checked first and so it should before replacing the Conductor Plate et al buuuuut ..............

on hard acceleration it will shift smooth first, second, third, fourth, fifth downshift smooth to fourth then into third it is a real harsh clunk and it slips completely out of gear as if I was in neutral.

That tells me it is unlikely to be Fluid Level, or Conductor Plate related, heavy throttle up shifts have a lot more torque going through the Box than a downshift so it is unlikely to be breaking loose due to low line pressure caused by lack of oil ;)

Also 4-3 cut loose is a well known fault on a 722.6 usually caused by the components I mentioned.

Considering the Starship Mileage I stand by my original statement to not waste time and fit parts to a well travelled transmission, when a good used unit can be fitted in 2 hours or less ;)
In my 'hey day' I've changed 722.6's in 20 minutes on some MB's 😈
 

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@mysclass on Instagram 2000 S500 (sold) 2001 S430 on AMG Rims with Brabus Bumpers Lorinser side
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36 Posts
Discussion Starter #7
If my transmission is going out, How could I figure out what is causing my problem and rebuild the trans?
 

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W220 Moderator
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It is far cheaper to buy a low mileage used unit with a warranty.

Unless you have rebuilt Auto Transmissions before and have good knowledge of Electronic Auto's and the specialist tools such as Drum Spring Compressors etc etc I would not recommend rebuilding it yourself. Also I doubt you will have the machines / equipment to Rebuild the Torque Converter, or properly Flush the Oil Cooler (not simply a can of Kooler Clean) ;)

HTH,
 

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2000 :W220 - 1986 W201: 16v Nam,16v Euro- 2002:SL500 Silver Arrow.2002:Avalanche-
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Guys , what I did on my 722.6 on my W203 a year ago after experienced problem like your or like so many 722.6 gear box , What I had was a very success to solve this problem on 722.6 tranny and save big $$$$$$ . From my personal experiences this is like most older 722.6 up to 2008 or may be to 2010 tranny. This a very well know problem to many other our MW's forums who were lucky to married with 722.6 .
All 3 of 2-3 , 1-2,4-5 and 3-4 OEM overlap sleeves were worn out over time and since they did not have O-rings design on plungers ( Looks like a small caliper piston) therefore when your gear box getting older ATF fluid escape via these then hydraulic pressure loss ..voila ..gear won't shifts, flare shifts, harsh shifts ,bumps or slipping gears regardless you had changed fresh ( and expensive ATF..) or some time some of us installed new conductor plate and still panic after all .
Overlap sleeve are inside upper and lower valve body ( 2-3 and 4-3 are on upper body 1-2 , 4-5 at lower body),First you must remove tranny pan ( Drain all fluid first and save if you just freshly use or discard if too old) , drop governor body after conductor plate , and carefully drain completely all old AFT exist inside Gov body , air dry over night,clean pretty good first ( using flints free cloths)then reinstall a new Sonnax 68942-05K overlap control valve sleeve exact use for 722.6 tranny after remove all 3 old OEM plungers off , do this one at the time so you won't mess up their location if you are over 65 years of age ..:eek::eek: ( Google Sonnax valve sleeve kit package cost around $70.00) . I was also replaced a new Sonnax 68942-23K TCC damper( Comes as a kit cost around $40.00 minus plus) locates at lower valve body while gov body is still on your work bench and this is highly recommended .Reverse procedure with new conductor plate , filter & gasket ,ATF etc.. back to where they belong ( go to church and pray hard for what you just had done :rolleyes::sneaky:) All Sonnax kits may come with instructions but please read its first .
Basically we are re-store transmission hydraulic sealing so they shift smoothly, solidly.
Note : If you're recognizing so thick and heavy muddy metal ,worn or broken from gear clutches plates or small debris material from bottom gearbox pan then it's time may have to rebuild your tranny before replace sleeve kits to gov body but if there are some or tiny little and that's normal. At this moment on my 2000 W220 -722.6 tranny despite it over due of high mileage as 220K today ,with luck I don't have these problem yet ..it will come at some time in near future but I have no hesitation to perform this before rebuild tranny if nes.
Good luck to all of my friends. small
 

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@mysclass on Instagram 2000 S500 (sold) 2001 S430 on AMG Rims with Brabus Bumpers Lorinser side
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36 Posts
Discussion Starter #10
It is far cheaper to buy a low mileage used unit with a warranty.

Unless you have rebuilt Auto Transmissions before and have good knowledge of Electronic Auto's and the specialist tools such as Drum Spring Compressors etc etc I would not recommend rebuilding it yourself. Also I doubt you will have the machines / equipment to Rebuild the Torque Converter, or properly Flush the Oil Cooler (not simply a can of Kooler Clean) ;)

HTH,
Thank you for your time and help it is much appreciated, you always got a answer to my problems. If you see any used units around in Southern California Preferably close to San Diego Let me know.

I have noticed a whine similar to how a supercharger sounds about 3 weeks ago. The sound comes on in first and second gear, when in first gear around 2000-5000rpm it sounds exactly like a sc but we all know my 430 is n/a in second gear from 2000-4000rpm I hear the sound again, the sound comes from where the torque converter would be. am not sure if that is related to my transmission problems I am experiencing now have you ever experienced something like this, My buddy says he thinks it could be my trans pump but we are not sure
 

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Registered
@mysclass on Instagram 2000 S500 (sold) 2001 S430 on AMG Rims with Brabus Bumpers Lorinser side
Joined
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36 Posts
Discussion Starter #11
Guys , what I did on my 722.6 on my W203 a year ago after experienced problem like your or like so many 722.6 gear box , What I had was a very success to solve this problem on 722.6 tranny and save big $$$$$$ . From my personal experiences this is like most older 722.6 up to 2008 or may be to 2010 tranny. This a very well know problem to many other our MW's forums who were lucky to married with 722.6 .
All 3 of 2-3 , 1-2,4-5 and 3-4 OEM overlap sleeves were worn out over time and since they did not have O-rings design on plungers ( Looks like a small caliper piston) therefore when your gear box getting older ATF fluid escape via these then hydraulic pressure loss ..voila ..gear won't shifts, flare shifts, harsh shifts ,bumps or slipping gears regardless you had changed fresh ( and expensive ATF..) or some time some of us installed new conductor plate and still panic after all .
Overlap sleeve are inside upper and lower valve body ( 2-3 and 4-3 are on upper body 1-2 , 4-5 at lower body),First you must remove tranny pan ( Drain all fluid first and save if you just freshly use or discard if too old) , drop governor body after conductor plate , and carefully drain completely all old AFT exist inside Gov body , air dry over night,clean pretty good first ( using flints free cloths)then reinstall a new Sonnax 68942-05K overlap control valve sleeve exact use for 722.6 tranny after remove all 3 old OEM plungers off , do this one at the time so you won't mess up their location if you are over 65 years of age ..:eek::eek: ( Google Sonnax valve sleeve kit package cost around $70.00) . I was also replaced a new Sonnax 68942-23K TCC damper( Comes as a kit cost around $40.00 minus plus) locates at lower valve body while gov body is still on your work bench and this is highly recommended .Reverse procedure with new conductor plate , filter & gasket ,ATF etc.. back to where they belong ( go to church and pray hard for what you just had done :rolleyes::sneaky:) All Sonnax kits may come with instructions but please read its first .
Basically we are re-store transmission hydraulic sealing so they shift smoothly, solidly.
Note : If you're recognizing so thick and heavy muddy metal ,worn or broken from gear clutches plates or small debris material from bottom gearbox pan then it's time may have to rebuild your tranny before replace sleeve kits to gov body but if there are some or tiny little and that's normal. At this moment on my 2000 W220 -722.6 tranny despite it over due of high mileage as 220K today ,with luck I don't have these problem yet ..it will come at some time in near future but I have no hesitation to perform this before rebuild tranny if nes.
Good luck to all of my friends. small
Thank you very very much for the information, I will proceed to do that and get back to you guys.
 

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W220 Moderator
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Hi

Yes, the whine is the Pump is struggling to draw fluid due to debris from whatever has / is broken / breaking up.

Bearing in mind I live in NW Scotland, UK, I wouldn't have a clue where to get used units in USA.

The important thing here is I spent most of my life owning an Auto Trans Rebuilding firm, and 722.6 was one of our "Bread and Butter" Transmissions, when you get to the stage yours is at, don't clutch at straws in an attempt to save a well travelled Transmission, once in a while someone gets lucky, but normally, (and bearing in mind everything you have told me in this thread), this Tranny is not economical to repair.

Repeated chucking parts and fluid at it will just result in you likely getting frustrated and fed up with the Car, and very possibly costing way more than the price of a good used unit ;)

HTH,
 

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@mysclass on Instagram 2000 S500 (sold) 2001 S430 on AMG Rims with Brabus Bumpers Lorinser side
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Discussion Starter #13
Would it even be possible to estimate how many miles my transmission has left? How much does a used unit go for there?
Hi

Yes, the whine is the Pump is struggling to draw fluid due to debris from whatever has / is broken / breaking up.

Bearing in mind I live in NW Scotland, UK, I wouldn't have a clue where to get used units in USA.

The important thing here is I spent most of my life owning an Auto Trans Rebuilding firm, and 722.6 was one of our "Bread and Butter" Transmissions, when you get to the stage yours is at, don't clutch at straws in an attempt to save a well travelled Transmission, once in a while someone gets lucky, but normally, (and bearing in mind everything you have told me in this thread), this Tranny is not economical to repair.

Repeated chucking parts and fluid at it will just result in you likely getting frustrated and fed up with the Car, and very possibly costing way more than the price of a good used unit ;)

HTH,
 

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W220 Moderator
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Would it even be possible to estimate how many miles my transmission has left? How much does a used unit go for there?
No way to know, shorter lifespan though rather than long !!

£400 - £700 good used as opposed to £1500 upwards for a decent Rebuilt Guaranteed Unit complete with Torque Converter.
 

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If it has more than 150-180k miles don’t bother fixing it , find a good LOW mileage used unit , preferably from a car being parted out so you can see the mileage in the car (junkyards lie about mileage on units already removed )

When my w220 needed a tranny at 190k miles I a found a wrecked car with 80k miles and got the tranny for $500.
 

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@mysclass on Instagram 2000 S500 (sold) 2001 S430 on AMG Rims with Brabus Bumpers Lorinser side
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Discussion Starter #16
If it has more than 150-180k miles don’t bother fixing it , find a good LOW mileage used unit , preferably from a car being parted out so you can see the mileage in the car (junkyards lie about mileage on units already removed )

When my w220 needed a tranny at 190k miles I a found a wrecked car with 80k miles and got the tranny for $500.
A local junkyard has one for 178$ but the catch is you have to remove it and its in a dirt lot...thinking about it
 

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A local junkyard has one for 178$ but the catch is you have to remove it and its in a dirt lot...thinking about it
Why is the car in the Junk Yard ? Crashed is good, as it was likely running OK before the Crash ..................

Put a dipstick in it first, verify that Oil is clean and no "burnt smell". Can you verify the mileage ?? If you can't I'd pass on that ;)
 

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2000 S430, 2003 S430, 2000 S500, 2003 S600 TT, and 2005 E320 CDI
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OP, you're in Southern California? There are salvage yards all over the place parting out crashed W220's. I would suggest heading to www.car-part.com, plugging in your year and model, searching for "Transmissions", and having a look. There's a ton of 'em.
 

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@mysclass on Instagram 2000 S500 (sold) 2001 S430 on AMG Rims with Brabus Bumpers Lorinser side
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Discussion Starter #19 (Edited)
Why is the car in the Junk Yard ? Crashed is good, as it was likely running OK before the Crash ..................

Put a dipstick in it first, verify that Oil is clean and no "burnt smell". Can you verify the mileage ?? If you can't I'd pass on that ;)
Will do, What will a "burnt smell" signify? Why the vehicle is in the junk yard I have no clue, the price I stated is just a generic price for any transmission the lot stocks, not specifically 722.6. As cowboyt said there are salvage/junk yards all over the place parting out W220's as well as other old mercs.

I'm sure If I found a 722.6 removed from a car it will be more expensive.
 

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W220 Moderator
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Burnt clutches / very hard use usually = smelly oil

The reason for seeing the Trans in the car is that you can see if it was crash damaged, plus evaluate the general condition of the car .............
Worn seats/ carpets / pedal rubbers / steering wheel indicates high mileage, etc etc etc ................

It's no guarantee, but a helluva lot better than buying something off the shelf, where you don't have any idea of what it came out of, all you can do then is smell the oil / examine for clean oil ;)

It's all very good that the Breakers Yard might offer a Guarantee, but they aren't going to compensate you for Labour time, wasted Oil costs etc, so you need to try and cover all bases .............

Ideally you could get a drive in the car, but unlikely if it's in a salvage yard it, will likely already have bits missing that make that impossible ;)
 
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