• Mercedes 722.9 (7G) automatic transmission upgrades available from Weistec Engineering - Valve body, TCU, Torque Converter

      Here it is folks, what many said could not be done. For those keeping score, this marks the third breakthrough by Weistec Engineering (first being the M156 supercharger and second being CARB certification). The Mercedes 722.9 transmission is used in a variety of vehicles and made its debut in 2004. Tuners have struggled to upgrade it with some saying it was impossible due to electronic complications but parts are now available to take the transmission up to the 1000 pound-foot of torque handling range.

      The torque converter obviously does not apply to those with the MCT but the valve body, tcu, and other parts do. There will be more vehicles supported than just what is listed below.

      Here is what Weistec calls their Bullet Proof Transmission Upgrade:




      The transmission receives upgraded clutch packs, new gaskets and seals, filter, pump, and associated hardware. This also includes the valve body and TCU upgrade which can be purchased separately. Pricing? $5,489


      Key Features:
      • Increased Torque Capacity
      • Upgraded Clutch Packs Containing More Clutch Discs
      • Redesigned Clutch Piston Geometry
      • Increase Frictional Surface Area
      • Increased Clutch Material
      • Improved Heat Dissipation
      • New Gaskets and Filter
      • New Transmission Fluid Pump
      • New OEM Fasteners and Hardware
      • Fully Assembled and Ready to Run
      • Used by some of the fastest AMG vehicles


      Supported Platforms
      • 2008-Present C63 AMG (Sedan and Wagon)
      • 2012-Present C63 AMG Black Series
      • 2007-2008 CLK63 AMG
      • 2008 CLK63 Black Series
      • 2007-Present CLS63 AMG
      • 2007-Present E63 AMG (Sedan and Wagon)
      • 2007-Present S63 AMG
      • 2007-Present ML63 AMG
      • 2007 R63 AMG
      • 2008-Present CL63 AMG
      • 2009-2011 SL63 AMG



      722.9 Valve Body and TCU Upgrade


      This is the first and only valve body upgrade for the 722.9 transmission. This part improves the way the transmission shifts and increases line pressure. The changes in the TCU are made to compliment the hardware and make sure it all works correctly. With the increased pressure and software to compliment it this prevents the clutches from slipping. Turnaround time of 3 days, your parts must be used.

      Valve Body and TCU Upgrade priced at $1,478

      Key Features:
      • Increased Line Pressure
      • Faster Shifting
      • More Precise Shifting
      • Improved Transmission Lifespan
      • New Gaskets
      • New Filter
      • New Hardware




      722.9 Torque Converter


      This is the first and only upgraded torque converter for the 722.9 transmission. A lot of firsts coming from Weistec who continues to work their magic on Mercedes platforms.

      This does feature a higher stall of 2500 rpm which should help launches at the track considerably. Weistec stated that in their testing 60 foots dropped around two tenths which will have a large impact on a 1/4 mile elapsed time. It will also support over 1000 horsepower.

      Price is $2849.99

      Key Features:
      • Computer Designed
      • CNC Machined Billet Stator
      • 2500 RPM stall speed
      • +1000HP capable
      • Reduced 60 foot times
      • Improved Low Speed (Around Town) Driving
      • Maintains Factory Drivability

      .
      This article was originally published in forum thread: Weistec 7G Trans Upgrades started by JRCART View original post
      Comments 55 Comments
      1. mramg1's Avatar
        mramg1 -
        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        Not following you. Who is "my buddy"?

        You mean MHP?

        Is the MHP hatred necessary in Weistec's thread?
        In a word, Yes becuase fo false advertising. IMHO
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        I'm just trying to get questions answered before I take the plunge. SLS AMG states it's a tuning issue and only Weistec can do the work, you state otherwise.
        What do you mean? I'm not stating otherwise.

        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        I'm back to square one. Can Weistec answer some of these questions?
        It's Sunday but I'll help get you as many answers as possible. Just let me know all your questions.
      1. mramg1's Avatar
        mramg1 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Nobody else has a torque converter for this trans...

        I understand and agree, but let's face it. A TC is a TC. the MB TC has nothing magical about it, and charging that kind of money is going to limit sales to about 10 I predict. I hope I am wrong here, but ONLY the true draggers are going to pay that kind of a premium for a TC.

        It is NOT anything special to change the stator or impeller. Companies have been doing this for decades with other brands my friend.
      1. mramg1's Avatar
        mramg1 -
        Click here to enlarge Originally Posted by mramg1 Click here to enlarge
        In a word, Yes becuase fo false advertising. IMHO
        Thanks MHP fan boys for the repClick here to enlarge

        As usual showing your true colorsClick here to enlarge
      1. PetroC63's Avatar
        PetroC63 -
        I asked this.

        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        It seems that a couple of people plan on shipping their transmissions to Weistec for these upgrades. Is this the only option we have? Can't a competent transmission shop perform these upgrades? Can the torque converter be installed for those who are interested in a higher stall only and are not making the kind of power that Keith, Jim and Earl are making?

        My main interest is the torque converter for now. Eventually I would like to add the rest of the trans upgrades if/when I'm ready for a blower.

        Thanks in advance.
        You answered with this.

        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        As stated the valve body and TCU upgrade requires your hardware. You can probably just have the other parts installed.
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I believe the valve body can be removed and sent in.

        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        What do you mean? I'm not stating otherwise. It's Sunday but I'll help get you as many answers as possible. Just let me know all your questions.
        I guess I misunderstood you. My apologies.

        I appreciate the help. Answers today are not necessary.
      1. LZH's Avatar
        LZH -
        Click here to enlarge Originally Posted by mramg1 Click here to enlarge
        GRAET stuff from Weistec.

        But come on, 3K for a TC. I had a custom one made back in the 80's from B&M for only 800 bucks. And it was certainly higher than 2500Click here to enlarge
        Annual inflation since the 80's is about 2.93% and that $800 buying power spent now would buy you right around $2k so the extra $500 for an AMG trans upgrade is actually pretty cheap compared to the domestic part you had built way back when most of the people on this board were being born Click here to enlarge
        In other words....the products being offered are pretty damn reasonable especially when you consider how much MHP charges for their "CDT" bull$#@!.

        And I repped ya to even out the neg you got for what was a very appropriate comment given the topic here. Funny how Andy said nobody would ever get a blower to work and nobody would ever be able to tune the TCU like he does and Weistec continues to prove him wrong time and time again. Now look where his customers are going....LOL.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by mramg1 Click here to enlarge
        I understand and agree, but let's face it. A TC is a TC. the MB TC has nothing magical about it, and charging that kind of money is going to limit sales to about 10 I predict. I hope I am wrong here, but ONLY the true draggers are going to pay that kind of a premium for a TC.

        It is NOT anything special to change the stator or impeller. Companies have been doing this for decades with other brands my friend.
        Do not disagree just pointing out the limited market and how the pricing fits it.

        Bigger market than for my trans even at 10, let me put it that way.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        I guess I misunderstood you. My apologies.
        It's ok. For the Valve Body and TCU it is a 3 day turnaround that does not require your entire transmission. It has to be your valve body and TCU though.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        I appreciate the help. Answers today are not necessary.
        I prefer to go above and beyond. I have an Iphone, I can help pretty much whenever and wherever. For all you know I'm doing this while watching basketball Click here to enlarge
      1. LZH's Avatar
        LZH -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        It's ok. For the Valve Body and TCU it is a 3 day turnaround that does not require your entire transmission. It has to be your valve body and TCU though.
        And removing both requires cracking the transmission as they are both buried in the body of the trans and epoxied into place IIRC.
      1. suicidal4liife's Avatar
        suicidal4liife -
        Click here to enlarge Originally Posted by mramg1 Click here to enlarge
        GRAET stuff from Weistec.

        But come on, 3K for a TC. I had a custom one made back in the 80's from B&M for only 800 bucks. And it was certainly higher than 2500Click here to enlarge
        With inflation $800 in 1980 is equal to about $2200 in today's money so Weistec is not that far off the mark
      1. whipplem104's Avatar
        whipplem104 -
        The control unit is simply bolted to the top of the valve body. Removing them both and sending them in is not a big deal. Remove the pan and remove the valve body. The issue for someone doing this themselves is filling the transmission when you are done. It is filled from the drain plug and set a s specific temperature.
        As far as the tq converter is concerned it is not anything special. In fact it is pretty much the same as the 722.6 5 speed. Different bolt pattern for the flywheel. The only issue I would see with a standard stall from one of the many out there would be knowing exactly what to do to get the results you want and not loose drivability. Also if you are going to hit any torque limiters. You are not paying extra for the same labor and materials. You are paying for someone figuring out what works with the software.
        The modifications for the transmission are not going to be anything extra ordinary either but I would assume that they are machining some parts for more clutch packs. So it is not so easy to send out kits to you and have someone install them. This requires a fair bit of expensive transmission parts to do and then you have to trust the guy putting them in. I would not do it and I am the guy that would put them in. If something goes wrong the blame game gets started. I would either build the transmission my self or have someone else do it.
        They should just get a couple cores to build though for exchange. Another 12-1400 and you can have a new valve body if the Mercedes will even let you have one these days.
      1. JRCART's Avatar
        JRCART -
        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        It seems that a couple of people plan on shipping their transmissions to Weistec for these upgrades. Is this the only option we have? Can't a competent transmission shop perform these upgrades? Can the torque converter be installed for those who are interested in a higher stall only and are not making the kind of power that Keith, Jim and Earl are making?

        My main interest is the torque converter for now. Eventually I would like to add the rest of the trans upgrades if/when I'm ready for a blower.

        Thanks in advance.
        Your buddy Andy at MHP tried a couple TCs on Keiths car a couple years ago and had no real success so your idea about wheeling your car down to your local Transmission shop wouldn't happen in a million years. If you want this upgrade Weistec is the only place you can find it.
      1. Weistec's Avatar
        Weistec -
        Hey guys we have been very excited to finally release these parts. It has been a lot of rigorous R&D but the result has definitely paid off. In an attempt to make the process as fast as possible for any core exchanges, we have inventoried many transmissions to cut turn around times. There is however a few hurdles with this process, mostly due to the fact that Mercedes has many different variations on the transmission and valvebody. With that said, the valvebody has electronics that are mated to a specific chassis, therefore our modification requires removal of the valvebody (transmission stays in the car, and an experienced tech can handle this in less than an hour) and the customer shipping to as to complete our modifications. As Whipplem104 explained, it is also possible for a customer to purchase a completely new valvebody from a dealership which can then get modified by us, and will then need to be installed and programmed by a dealership.

        Just to answer the question on hand, the valvebody can be removed from the transmission and the transmission will stay in the car. As for the transmission, we do require a core, but we have most if not all parts in stock but as I stated above, this is to cut down turn around times and get our customers up and running right away. Just for everyones information if it was not clear, our bullet proof transmission upgrade comes equipped with the valvebody modifications. Finally, the torque converter requires no core exchange. We have these in stock and ready to run. I hope this helps. It can be confusing to understand, so please feel free to call us or post up any questions you may have. Thank you guys!

        Weistec Engineering
      1. Sticky's Avatar
        Sticky -
        ^ There you guys go... and on a Sunday Click here to enlarge
      1. whipplem104's Avatar
        whipplem104 -
        The price of the converter with no exchange is really pretty good then.
        As far as removing the valve body in an hour this is true but this is to remove the vb. I charge 2.5 for a valvebody with no programming. Which this does not require. I would think that most would charge 3-3.5. Filling these and setting fluid level is just time consuming.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by whipplem104 Click here to enlarge
        The price of the converter with no exchange is really pretty good then.
        As far as removing the valve body in an hour this is true but this is to remove the vb. I charge 2.5 for a valvebody with no programming. Which this does not require. I would think that most would charge 3-3.5. Filling these and setting fluid level is just time consuming.
        Where do you work?
      1. whipplem104's Avatar
        whipplem104 -
        I am doing work for an independent in Bellevue, WA and have my own business there also. I am going to buy the other business out in the next year or two. Right now it is a little confusing for customers but cleaner on paper. Mercedes Centrum is the original business and mine is Sound German Automotive. Do not know how it will all shake out exactly.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by whipplem104 Click here to enlarge
        I am doing work for an independent in Bellevue, WA and have my own business there also. I am going to buy the other business out in the next year or two. Right now it is a little confusing for customers but cleaner on paper. Mercedes Centrum is the original business and mine is Sound German Automotive. Do not know how it will all shake out exactly.
        However it does, good luck.
      1. Even Money's Avatar
        Even Money -
        Click here to enlarge Originally Posted by whipplem104 Click here to enlarge
        I am doing work for an independent in Bellevue, WA and have my own business there also. I am going to buy the other business out in the next year or two. Right now it is a little confusing for customers but cleaner on paper. Mercedes Centrum is the original business and mine is Sound German Automotive. Do not know how it will all shake out exactly.
        This guy is a solid mechanic! I used him for my headers, quaife, brake rotors, and line lock install. Look no further for a mercedes tech!