BMW Diesel Transmission Adapter *NEW PRODUCT

Guru Autowerks


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Guru Autowerks of Houston, TX is excited to announce the imminent release of our ZF 6HP26/28 Automatic Transmission Conversion Kit for the BMW N54 and N55 Engines. Our initial release is aimed at the E9X 335i models; development on other models will follow.


We will include everything you need to bolt in your chosen ZF 6HP26/28 transmission and say goodbye to your 6AT woes. Our goal is to deliver the highest quality, head ache free conversion kit possible with top notch support and customer service. We believe that working closely with our customers and installers is essential. You're not just buying a product, we are also here to provide guidance, receive feedback and help facilitate an easy installation process.


As the N54/N55 aftermarket support has continued to grow through the hard work of numerous enthusiasts and companies; the need for a stronger automatic transmission has also grown. There are several options for transmission conversions; each are unique and have various installation obstacles. Our kit brings an affordable OEM like solution to the table that doesn't compromise drivability, handles abuse well and is simple to install. We are proud to become a small part of the community for these amazing vehicles and the people who enjoy them.



What to know...


  • The 6HP26/28 is nearly twice as strong as an OEM Spec 6HP19/21 and readily available.


  • OEM integration, no standalone TCU needed or wiring required.

    Utilizes a Gen 2 ZF 6HP TCU programmed to the vehicle and a custom transmission tune.


  • No transmission tunnel modification or fabrication required.

    Normal transmission replacement knowledge, tools and process.

    Affordable solution with a plethora of options for enthusiasts and professionals.


  • Reuse your OEM driveshaft, starter motor, flexplate, exhaust system, turbo inlets/outlets and differential.


  • Keep your existing transmission cooler setup with our adapters to fit OEM or AN lines.

    Direct fit Transmission Cooler upgrade kits will also be available.


  • Custom driveshaft available to match your differential.

    Most common differentials are the BMW 215LW, BMW M3 LSD & Ford 8.8 LSD.

    Specifications for customers to provide their own driveshaft will be available.


  • Shared components with the Ford 6R60/80 transmission provides aftermarket support for building the transmission to handle over 1000 ft-lbs of TQ. Upgraded torque converters and valve bodies are also available.

  • With proper cooling, maintenance and fluid choice these ZF transmissions handle abuse well.

    There is evidence when taken care of they outperform ZF Torque Ratings by up to ~50%. xHP Tuners rates their 6HP28 Transmission Stage 2 tune at 737ft-lb or 1000nm. Stage 3 tunes have torque limit removed and these transmission have been known to handle over 1000ft-lb TQ in stock form by some of the worlds top tuners.


    ZF OEM Torque Rating

    6HP19                      295ft-lb or 400Nm

    6HP21                      332ft-lb or 450Nm

    6HP26 Gen 1           443ft-lb or 600Nm

    6HP26/28 Gen 2     516ft-lb or 700Nm



Below is information on pricing and exactly what is needed for the entire install.

The entire cost of conversion will be about $3800 to $4000 not including labor.

You need the following...
$2400 - 6HP28 Adapter Kit - includes shipping via UPS ground within the US. Please ask for a quote on international shipping/import.

~$600-800 Donor 6HP28 Transmission

$350+ Sutphin Custom TransmissionTune (XHP Flasher License Required)

~$150 EGS VIN Coding. Remote winkfp or protools

~$150 Adrenaline or Redline ATF 3 Gal

~$150 New pan/filter, valve body sleeves, mechatronic seals, TC/Input Shaft seal

The only product sold by me is the "6HP28 Adapter Kit". All other components/ supplies are purchased by the customer or installer.

I provide one on one support for all of my customers/installers throughout the entire process by phone/video chat.

Are you having issues with your current transmission?

Current power/mods and future goals?

Let us know if we can help answer any other questions.

Joshua Armstrong
Guru Autowerks LLC


We have a 20-day return policy, which means you have 20 days after receiving your item(s) to request a return. Please note we charge a 25% restocking fee on all returns. To be eligible for a return, your item must be in the same original/new condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. To start a return, you can contact us at Items sent back to us without first requesting a return will not be accepted. You can always contact us for any return question at Please inspect your order upon arrival, and contact us immediately if the item is defective, damaged or if you received the wrong item, so that we can evaluate the issue and make it right.

Exceptions/non-returnable items:

Certain items cannot be returned, like sale items, perishable goods, custom products (such as special orders or personalized items), hazardous materials, flammable liquids, and/or gases. Please get in touch if you have questions or concerns about your specific item. Unfortunately, we cannot accept returns on sale items or gift cards.


The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.


We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember, it can take some time for your bank or credit card company to process and post the refund.