For those that have the rough 2-1 downshift in "S" mode - Mercedes-Benz Forum
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#1 (permalink) Old 01-12-2008, 08:27 PM
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For those that have the rough 2-1 downshift in "S" mode

MBUSA has just released a new valve body for the 7G transmission in the R-Class. I had my R500 in for service and they swapped mine out. The transmission has never shifted so smoothly since I've owned it. I can keep it in "S" mode all the time now and never feel it downshift into first when coming to a stop.

2004 E500 - Eurocharged ECU, VRP headers and E55 exhaust. #1 record holder on dragtimes (13.49@102.5)
2005 SL600 - OE Tuning ECU/ Speedriven TCU - #1 record holder on dragtimes (11.15@125.54)


http://www.youtube.com/watch?v=jqKECRhvlf4

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#2 (permalink) Old 01-12-2008, 09:31 PM
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Originally Posted by Benz-O-Rama View Post
MBUSA has just released a new valve body for the 7G transmission in the R-Class. I had my R500 in for service and they swapped mine out. The transmission has never shifted so smoothly since I've owned it. I can keep it in "S" mode all the time now and never feel it downshift into first when coming to a stop.
B-O-R,

Thanks for sharing the info. When did you have this done? Can you provide more info on the newly released "valve body"? Is this to cure the "downshit" feel of engine braking coming to a stop? I have a couple of software upgrades done and they cured the "jerking" for "upshifting" from 2-3 in the 20-30 mph. The car shifts up and down very smooth, except for coming to a stop. I do feel a "squeeze" of engine braking in the last 10-20 feet prior to a stop and has been thinking it is normal until I read your post. If possible, please type/post the diagnosis of symptom and work description completed from your service ticket. Thanks in advance.

BTW, do you use EMC in Germantown? I bought my car from Germantown but always take my car to EMC in Bethesda.

Loc

Last edited by RDriver; 01-12-2008 at 09:34 PM.
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#3 (permalink) Old 01-13-2008, 11:00 AM
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Yep, I take it to EuroMotorcars-Germantown. The shop foreman, Jeff, is very familiar with me and my fleet of MBs. They've gotten to know me very well there, unfortunately.

But yep, it has completely solved the rough 2-1 downshift. The car literally feels like it's in neutral coming to a stop, it's that smooth now.

This is taken directly from my service sheet:


...Replaced electro hydraulic valve body per WSG Case 710131492. Performed SCN coding and learning process after repair. Road test to adapt transmission.

Here are the parts listed:

(1) 220-270-21-06 Valve Gear
(12) 001-989-45-03-13 Transmission
(1) 007603-012102 Ring, General
(6) 004-990-35-12 Screw
(1) 220-271-03-80 Gasket

274989 Valve Body - 722.9 Trans-R&R
271256 Oil Level - Auto. Trans (After Leak Test) Check/correct
271047 Adaptation, Perform (After Repairs)

I know the parts and task list can be a little cryptic but it looks like they replaced the valve body, checked the tranny for leaks and fluid level. Then reset the adaptation.

The shop foreman told me that MBUSA wouldn't allow them to put in the new valve body in the past but now they are for some reason.

Hope this helps. I can tell you that the car has never shifted this smooth, ever.

2004 E500 - Eurocharged ECU, VRP headers and E55 exhaust. #1 record holder on dragtimes (13.49@102.5)
2005 SL600 - OE Tuning ECU/ Speedriven TCU - #1 record holder on dragtimes (11.15@125.54)


http://www.youtube.com/watch?v=jqKECRhvlf4

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#4 (permalink) Old 01-13-2008, 06:43 PM
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Originally Posted by Benz-O-Rama View Post

This is taken directly from my service sheet:


...Replaced electro hydraulic valve body per WSG Case 710131492. Performed SCN coding and learning process after repair. Road test to adapt transmission.

Here are the parts listed:

(1) 220-270-21-06 Valve Gear
(12) 001-989-45-03-13 Transmission
(1) 007603-012102 Ring, General
(6) 004-990-35-12 Screw
(1) 220-271-03-80 Gasket

274989 Valve Body - 722.9 Trans-R&R
271256 Oil Level - Auto. Trans (After Leak Test) Check/correct
271047 Adaptation, Perform (After Repairs)

The shop foreman told me that MBUSA wouldn't allow them to put in the new valve body in the past but now they are for some reason.

Hope this helps. I can tell you that the car has never shifted this smooth, ever.
This is GREAT!

Thank so much for sharing. This is helpful to a lot of us.
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#5 (permalink) Old 01-20-2008, 11:10 AM
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anyone else have the same success story?
I've been having the rough downshift to 1 since day 1 and it would be great if this is the cure...
RDriver, have you taken your R in yet?
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#6 (permalink) Old 01-20-2008, 10:16 PM
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great news....i wonder if they tried that valve body...they tried two before replacing the entire tranny in ours...now we have negotiated the transfer to a 2008 r320 to replace the 2007....we pick the new car up tues

2007 R 320 CDI PKG 1 w/RSE (wife's)
1984 300SD daily driver (dads old car)
1986 Grand National 76,000 miles (going for 9's in the quarter)
1987 Grand National (daily driver)
2004.5 Duramax LLY runs low 9's in the 1/8th
1989 TTA #1406 (64,000 miles) sold
1987 Buick Regal Limited Turbo T
2004 Kawie 700 Prairie 10.30 in the 1/8th
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#7 (permalink) Old 01-20-2008, 11:08 PM
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I have experience the "hard shifting" from 2-1 in S mode when I use the manual shifters and take it off automatic. I don't think it's normal and I am going to contact the dealer and inquire about the new valve body. I will keep you guys updated.

Last edited by smxnyc; 01-20-2008 at 11:24 PM.
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#8 (permalink) Old 01-21-2008, 02:42 AM
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there is no "newly released" valve body for the r class. updated valve bodies have been out for years for every new MB model. usually all MB models will come with a 1206, 1306 or 1406 valve body. updated valve bodies are usually a 1306 for the 06 and older e class as a 1806 is for newer mid 06 and 07 e classes and newer. new s classes and most other mb models require a 1806 or 2106 valve body. if you still have trans issues and you have the most up to date valve body and trans software and the problem cant be fixed, MB will approve the replacement of the trans.

now 9 times out of 10 a new valve body will correct the rough 2-1 downshifts. trans software updates are like a band aid. they cure it for a while.
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#9 (permalink) Old 01-21-2008, 09:28 AM
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Whether it's a newly released valve body or not, the shop foreman at my local MB dealer stated that MBUSA has just started allowing them to replace these valve bodies with an updated one. He could've been misinformed, or just plain making it up, I don't know. But I can tell you, with 100% certainty, that my R500 has never shifted so smooth since they replaced mine. You can't feel the 2-1 downshift at all anymore.


I would suggest to anyone having this problem, to print my post above and take it to their dealer.

2004 E500 - Eurocharged ECU, VRP headers and E55 exhaust. #1 record holder on dragtimes (13.49@102.5)
2005 SL600 - OE Tuning ECU/ Speedriven TCU - #1 record holder on dragtimes (11.15@125.54)


http://www.youtube.com/watch?v=jqKECRhvlf4

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#10 (permalink) Old 01-21-2008, 06:24 PM
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MBUSA has allowed for valve body replacement for years. as long as its approved by WSG, there is a form that team leaders or shop foremans fill out on netstar that requests a valve body or trans replcement on a vehicle. you give MBUSA the vehicle info, issues and what has been done. you get a yes or no answer. now most of the time, techs will just flash the trans control unit. usually a valve body get requested after several complaints or when a fault is stored in the tranny. 99% of faults that occur in the tranny require a new valve body.
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