"FAQ" LS LT SB BB 8HP70 75 Dodge Adapter - BMW E9x E8x E6x

GM LS LT SB BB Engine to 8HP Dodge Transmission Adapter

Compatibility Overview

Vehicle: BMW E9x E8x E6x

(Ask us about F-Series)

Engine: GM V8 - LS LT SBC BBC

Transmission: Dodge Ram Durango Charger Challenger 8HP70 75 RWD

Driveshaft: Stock E9x E8x 105mm or Aftermarket 1350 U-Joint

Starter: OE Shrouded or Aftermarket Unshrouded – No Modification Required

Mounting: Billet Upper Bracket. OE Bushings & 6HP A/T Lower Bracket. Adjustable Lower Bracket from LSE90.

Cooler Lines: Billet 8AN Adapter Block w/PTFE Line Kit. Optional 10AN sizing available.

Cooler Setup: Adapt an existing Transmission Cooler or consult with us to add a Cooler & Thermostat Package.

Shifter: F-Series Shifter Adapter w/Manual Park Release Mechanism – Or Consult with us about other options.

Flexplate: OEM GM or Aftermarket Flexplate; 3-Bolt 11-1/16" Ø Dia., 3-Bolt 10-3/4" Ø Dia., 6-Bolt 11-1/2" Ø Dia.

Crankshaft: Compatible with typical Short Crank & early model Long Crank; No changes required.

What is the Total Conversion Cost for 8HP70/75 into the E9x or E8x Chassis?

Average minimum conversion cost starts out around $4000-$5000 when utilizing a stock 8HP70/75; Labor cost not included. This a broad overall estimate taking into account the cost of ALL necessary components listed below for a basic conversion.GA3-V1 Conversion Kit, 8HP70/75 Transmission, Standalone TCU/Wire Harness, Fluid, Service Parts, Coding & Tuning.

What other components & services are required to complete the conversion?

*8HP70 Gen 1 or 8HP75 Gen 2 – Dodge RWD GEN3 HEMI

*Standalone TCU & Wire Harness – MaxxECU, Turbo Lamik, CANTCU, Sound German etc.

*3 Gallons ATF – Adrenaline Speed Shift ATF or Similar Group IV Synthetic Fluid Recommended.

*Service Parts – New Pan/Filter Assembly, Mechatronic Connector Seal, Input Seal etc.

*Coding – Various requirements based on Standalone TCU/Vehicle – Contact Eric at Houston BMW Coding.

*Tuning – Varies based on Standalone TCU chosen, vehicle build requirements & overall complexity.

*Labor – We Provide direct project support from A to Z for DIY or Professional installations.

How much power can this transmission setup support?

Stock Factory Rating – 8HP70 @516 lb-ft or 700nm, 8HP75 @551 lb-ft or 750nm.

Both of these stock transmission cores commonly handle 600-800 lb-ft.

Transmissions can be built to handle 1000+ lb-ft TQ with upgraded clutch packs & billet components. Proven 7 & 8 Second 1/4-Mile Drag Racing Capability by Dodge & BMW Platforms.

What are the differences between the Ram, Durango, Charger & Challenger 8HP70/75?

We recommend using the "Ram" version whenever possible for lowest cost and ease of installation. The "Truck" versions of the 8HP70/75 has two starter bubbles, smooth bore transmission line ports & factory 1350 output driveshaft flange. Best availability & pricing for these cores due to the high production numbers over a decade.

The "Durango" version of the 8HP70/75 is almost identical to the "Truck" version but has two small differences. CV style output flange requires adapter for 1350 U-Joint. Transmission line ports are threaded instead of smooth bore like the "Truck" version.

The "Charger/Challenger" version of the 8HP70 has four slight differences that add complexity to the installation process. Starter fitment requires cutting the bellhousing for OEM starter fitment. Alternatively an unshrouded starter may be used without modification. The output flange is not compatible with 1350 U-Joints. Transmission line ports are threaded instead of smooth bore like the "Truck" version. No bolt boss location on LH side for mounting our Manual Park Release Cable Bracket.

Are any modifications required to fit the 8HP70/75 assembly in E9x/E8x?

Recommended Mod #1 Transmission Tunnel Clearance

Remove unused bolt mounting bosses on body/bellhousing that may interfere with the transmission tunnel. Necessary Tools for Mod #1 = Die or Angle Grinder with Sand/Flap Disc/Carbide Burr/Grinding Stone etc. Cut/Grind away bolt mounting bosses and smooth/contour the surface for maximum tunnel clearance.

Optional Mod #2 N/A Exhaust/Header Clearance

Remove LH starter bubble to allow Headers/Exhaust Clearance. Not necessary for most Turbo Setups. Necessary Tools for Mod #2 = Die or Angle Grinder with Sand/Flap Disc/Carbide Burr/Grinding Stone etc. Cut/Grind away LH Starter bubble and profile to the shape of the Adapter plate to allow maximum exhaust clearance.

What gear ratios does the 8HP70/75 have?

Both the 8HP70 & 8HP75 have Eight forward speeds and share the same ratios listed below.

4.714, 3.143, 2.106, 1.667, 1.285, 1.000, 0.839 and 0.667:1

What Torque Converters are compatible?

2013-2017 OEM Dodge Gen 1 8HP70 5.7L Torque Converter – 34mm O.D. Small Pilot

2018+ OEM Dodge 5.7L Gen 1 & 2 Torque Converter – 46mm O.D. Large Pilot – Minor Modification REQUIRED

Circle D HP & Pro-Series Dodge 8HP70/75 Torque Converters – Custom Built; 34mm O.D. Small Pilot REQUIRED

What Starters are compatible?

Smooth Nose Gen III & Gen IV – Ram/Durango No modification required. Charger/Challenger Minor modification required.

Aftermarket Unshrouded – No modification required; Most high torque starter.

Ribbed Nose Gen III – Ram/Durango No modification required. Charger/Challenger Minor modification required. OEM 10+ Camaro/Caprice/G8 – Ram/Durango No modification required. Charger/Challenger Minor modification required.

What driveshafts are compatible? OEM, M3, Ford 8.8?

OEM E9x/E8x or M3 driveshafts 2-Piece require no modification; Reuse OEM BMW 6HP105mm Output Flange. Ford 8.8 & 1350 U-Joint driveshafts are directly compatible with the "Truck" Output Flange of the 8HP70/75; Requires using matching OEM Dodge 1350 U-Joint Flange Part# 68417915A – Please consult with us for further assistance.

When should the transmission be purchased?

While you can purchase a transmission at anytime we recommend purchasing approximately 1-3 weeks ahead of the installation date. Once in your possession we recommend a pre-installation inspection. Most Used Parts have a 30 day money back return period with a receipt. So if any issues are discovered you need to return it quickly. Keep in mind the buyer of a transmission is usually responsible for returning the item locally or paying for return shipping cost which can be substantial.

Where do I find a transmission and what help is provided to ensure a good outcome?

We provide direct support to all customers and strongly encourage them to work with us through this process. Car-Part, eBay and LKQ are most common recommended sources for used transmissions. Be mindful when purchasing from individuals or any business with cash/no receipt. Ask what the return policy is ahead of time to avoid surprises & always get a receipt.

Our process starts with a broad search of donors that meet our criteria. Using the VIN number we gather Auction/Sale/Wreck information which is used to help verify the advertised mileage and condition of the transmission is accurate. Reviews of the Auto Parts Yard selling the product are also checked. We consult with the customer on choosing one of these transmissions.

We cannot guarantee or be responsible for the condition of these used transmissions but we work hard to reduce the risk and difficulty associated for customers unfamiliar with the process. Local sale is preferred but shipping is common. When receiving freight its best to have a business address or location with a loading dock/forklift or request pickup at your local freight terminal. Residential addresses lift gate service adds cost to freight quotes & most sellers prefer a business/terminal address.

What about the transmission cooler setup?

Our kit comes with everything needed to adapt an existing AN8 or AN10 transmission cooler; Including the following. 8HP AN Adapter, 8AN PTFE Line Kit w/10 fittings, 10AN/8AN Reducers & A/T Radiator Block-Off for deleting OEM Cooler. Not sure what parts you need? Consult with us directly to add a cooler core & inline thermostat to your kit. Below are standard components that can be added to the kit or customers may utilize their own preferred components.

19 or 25 Row Cooler mounted in front of the radiator is most common – Simple; benefits from Radiator Fan airflow

25 or 30 Row Cooler mounted in wheel well – Add louvered panel to the wheel liner for airflow & rock guard.

165F Thermostat recommended to ensure quick warmup times; especially for daily driver and colder climate setups.

What is a TCU & what options are available to control the 8HP Transmission?

"Transmission Control Unit" is the computer which controls the transmission much like an ECU/Engine Control Unit.

Standalone TCU Options – MaxxECU, Turbo Lamik, CANTCU, Sound German etc.

What is required to install the Standalone TCU?

The complexity of standalone installation greatly depends on the controller chosen, its capabilities & components supplied. Some have plug & play wire harness options while others will require intermediate to advanced level wiring to make your own harness. We recommend consulting with the Standalone TCU manufacturer's website & installer/tuner before purchase.

MaxxECU – CAN based TCU for Dodge Gen 1 8HP or Combo ECU/TCU for LS engine and Gen 1 8HP. Multiple ECU model options available with unterminated and custom terminated harnesses. Wide range of features including Trans-Brake launch control, CAN bus integration and much more. Great bang for buck race-oriented ECU/TCU. Extensive support/wiki/community.

TurboLamik – Direct Control based TCU for Gen 1 & Gen 2 8HP. Requires removing OEM TCU Chip or "Brain" to hardwire directly into the solenoids/sensors. Wide range of features; Trans-Brake & Virtual Clutch Pedal for Drift Car setups. Well suited to Race setups requiring a high level of control with minimal restrictions. Well established with good support & community. CANTCU – CAN based TCU for Dodge/BMW Gen 1 & Gen 2 8HP; available with pre-made harness or unterminated. CANformance & XHP Tuning/Flash Options. OEM style launch control. Effective solution with easy installation, large compatibility range, customer support and instructions. Excels at OEM level driveability w/some race features.

Sound German PCS – CAN based TCU for Dodge Gen 1 & Gen 2 8HP. Requires Dodge Shifter. Small package with basic wiring/inputs required. Custom calibration/tuning files available through Sound German. Many features including paddle shifters, Sport/Track mode & Trans-Brake launch control. Knowleadgable support & customer service.

What shifters are compatible?

Our Shifter Adapter included in this kit is designed for the F-Series Electronic Shifter.

Ask us about adding a pre-sourced good condition F-Series shifter to your kit or source your own. Premium "DCT" branded sequential style short and long handled shifters are also available!

There are two compatible BMW F-Series shifters which both have 10 pin connectors located at the front side. BMW F2x/F3x/F8x – 61319296896 or F0x/F1x – 61319296904 – Use RealOEM.com for cross reference information.

Other BMW F/G-Series, Dodge & aftermarket shifters may be compatible depending on the Standalone TCU being used. Please consult with us prior to purchase if you intend to use another shifter; Custom shifter adapter will be required.

Will cruise controls work?

Yes; Dependent on chosen Standalone TCU/ECU etc. Wiring may or may not be required.

Will steering wheel paddle shifters work?

Yes; Dependent on chosen paddle shifters & Standalone TCU/ECU etc. Wiring may or may not be required.

Is this compatible with Manual, DCT or AWD E9x/E8x models?

Yes but certain parts are required for proper fitment.

Manual & DCT – Use E9x/E8x 6HP A/T Lower Bracket 2326778060 or LSE90.com adjustable "DCT Lower Bracket". AWD vehicles will require a different custom Lower Bracket. Please consult with us before proceeding.

How does shipping work?

Our preferred method of shipping is UPS Ground; Fully Insured & Signature Required.

Upon final payment customer is notified of estimated shipping date.

Confirmation of package drop-off and tracking information are provided ASAP.

Expedited & International shipping quotes available upon request.

What about local sales tax?

8.25% Sales Tax will be applied to Texas orders.

What about International import fees?

International customers are responsible for all customs import taxes, duties & tariffs.