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    • 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. Mthis's Avatar
        Mthis -
        Nice upgrade
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Mthis Click here to enlarge
        Nice upgrade
        That it is. At one time I didn't think this platform would get as far as it is getting now.
      1. 0-60Motorsports's Avatar
        0-60Motorsports -
        Awesome work by Wiestec. Pricing is very reasonabe too.
      1. SLS AMG's Avatar
        SLS AMG -
        Amazing. I hope they have something for my SLS
      1. DAGREEKNYC's Avatar
        DAGREEKNYC -
        about time . And a Stall too ?? Great . Where were you a year ago !!!!!
      1. LZH's Avatar
        LZH -
        So for about 10k you get a fully built transmission....sounds pretty reasonable to me for an AMG and the 3 day turnaround time is pretty impressive, too. Nice job Wesitec. Bet there are lots of guys out there who claimed to be able to tune the TCU who are scratching their heads right about now lol.
      1. Even Money's Avatar
        Even Money -
        How much for shipping the tranny, or is that included? Faster shifting? By how much?
      1. mramg1's Avatar
        mramg1 -
        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
      1. PetroC63's Avatar
        PetroC63 -
        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.
      1. Sticky's Avatar
        Sticky -
        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.
        As stated the valve body and TCU upgrade requires your hardware. You can probably just have the other parts installed.
      1. Sticky's Avatar
        Sticky -
        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
        Nobody else has a torque converter for this trans...
      1. Dads C63's Avatar
        Dads C63 -
        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.
        Knowing whats at stake I wouldn't want anyone doing the work except Weistec.
      1. PetroC63's Avatar
        PetroC63 -
        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.
        Thank you.

        My original question should have been clearer. Do I need to send my trans to Weistec for the valve body/tcu upgrade or can my stock valve body be removed and sent to them instead?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
        Do I need to send my trans to Weistec for the valve body/tcu upgrade or can my stock valve body be removed and sent to them instead?
        I believe the valve body can be removed and sent in.
      1. PetroC63's Avatar
        PetroC63 -
        Click here to enlarge Originally Posted by Dads C63 Click here to enlarge
        Knowing whats at stake I wouldn't want anyone doing the work except Weistec.
        Understood.

        I'm trying to minimize downtime if I can, since the vehicle is my daily driver. Honestly, pulling the trans out and shipping it cross crounty is not an option for me. I have a local shop that works stricly on benzes and can do the work.
      1. PetroC63's Avatar
        PetroC63 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I believe the valve body can be removed and sent in.
        Thanks Sticky.
      1. SLS AMG's Avatar
        SLS AMG -
        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.
        The Answer is No. Tuning is the major barrier in this situation. Nobody has been able to mess with the TCU of these cars. Weistec are the only ones. Your buddy seems to be tuning "the whole driveline for the 63 AMG", lets see if he can do something about itClick here to enlarge
      1. PetroC63's Avatar
        PetroC63 -
        Click here to enlarge Originally Posted by SLS AMG Click here to enlarge
        The Answer is No. Tuning is the major barrier in this situation. Nobody has been able to mess with the TCU of these cars. Weistec are the only ones. Your buddy seems to be tuning "the whole driveline for the 63 AMG", lets see if he can do something about itClick here to enlarge
        Not following you. Who is "my buddy"?

        You mean MHP?

        Is the MHP hatred necessary in Weistec's thread?
      1. Sticky's Avatar
        Sticky -
        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?
        Definitely not but it is valid to point out how past transmission tuning claims were overblown. As well as statements that this could not be done.
      1. PetroC63's Avatar
        PetroC63 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Definitely not but it is valid to point out how past transmission tuning claims were overblown. As well as statements that this could not be done.
        Understood. Let him start another thread about it.

        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.

        I'm back to square one. Can Weistec answer some of these questions?