4200 TO GM SBC/BBC/LS ADAPTER
Posted: Sat Jul 26, 2025 7:26 pm
This adapter plate allows SBC/LS bolt pattern transmissions to be used behind the Atlas**.
Examples are T56, Tremec, NV4500, TH350/TH400/4L80e/6l80/90 etc...
The plate has sufficient material added to the side to allow it to be used as a mid-engine mount plate. Additional material was added on the bottom to accommodate installation of a billet main cap girdle. The plate is 3/8" thick.
We can also produce custom adapter plates. Inquire for details.
For Price, shipping cost & to order please fill in our contact us form, please include your zip/postal code in order for us to provide a shipping cost.
** 4&5 cylinder applications(2800, 2900, 3500 & 3700) will require the end user to remove additional material to clear the balance shaft drive.
This adapter plate allows SBC/LS bolt pattern transmissions to be used behind the Atlas**. Examples are T56, Tremec, NV4500, TH350/TH400/4L80e/6l80/90
The plate is 3/8" thick. The plate is laser cut and then CNC machined.
The plate has sufficient material added to the side to allow it to be used as a mid-engine mount plate. Additional material was added on the bottom to accommodate installation of a billet main cap girdle.
We can also produce a plate with the SBC/LS transmission mounting holes deleted for use with other transmissions e.g. AMC/Jeep
For customers using other transmissions we can do a fit study to see if the proposed transmission will work, there is no charge for this.
You need to supply the bolt pattern and dowel hole locations referenced to the input shaft center line.
Note: If the OEM flywheel/flex plate for the proposed transmission is less than 13.7" in diameter - It will not fit without modifying the bellhousing.
For Price, shipping cost & to order please fill in our contact us form or contact use at info@emtechmotorsports. Please include your zip/postal code to allow us to get a shipping cost.
** 4&5 cylinder applications(2800, 2900, 3500 & 3700) will require the end user to remove additional material to clear the balance shaft drives.
Examples are T56, Tremec, NV4500, TH350/TH400/4L80e/6l80/90 etc...
The plate has sufficient material added to the side to allow it to be used as a mid-engine mount plate. Additional material was added on the bottom to accommodate installation of a billet main cap girdle. The plate is 3/8" thick.
We can also produce custom adapter plates. Inquire for details.
For Price, shipping cost & to order please fill in our contact us form, please include your zip/postal code in order for us to provide a shipping cost.
** 4&5 cylinder applications(2800, 2900, 3500 & 3700) will require the end user to remove additional material to clear the balance shaft drive.
- unnamed (1).jpg (23.74 KiB) Viewed 64 times
The plate is 3/8" thick. The plate is laser cut and then CNC machined.
The plate has sufficient material added to the side to allow it to be used as a mid-engine mount plate. Additional material was added on the bottom to accommodate installation of a billet main cap girdle.
We can also produce a plate with the SBC/LS transmission mounting holes deleted for use with other transmissions e.g. AMC/Jeep
For customers using other transmissions we can do a fit study to see if the proposed transmission will work, there is no charge for this.
You need to supply the bolt pattern and dowel hole locations referenced to the input shaft center line.
Note: If the OEM flywheel/flex plate for the proposed transmission is less than 13.7" in diameter - It will not fit without modifying the bellhousing.
For Price, shipping cost & to order please fill in our contact us form or contact use at info@emtechmotorsports. Please include your zip/postal code to allow us to get a shipping cost.
** 4&5 cylinder applications(2800, 2900, 3500 & 3700) will require the end user to remove additional material to clear the balance shaft drives.
- unnamed (1).jpg (23.74 KiB) Viewed 64 times