Transaxle and Clutch

Porsche Transaxles

You will be able to use your Porsche transaxle with an LS3 swap. You will need an adapter plate and custom flywheel to mate them with an LS engine. These Porsche transaxles fall in two main categories.

G96/00, G96/01, G96/30, G96/31, G97/01, G97/31 (Audi Based)

 For the 996 Carrera, Cabriolet, and Targa, they came with the G96/00 or G96/01 transaxle. This transaxle is based on an Audi transmission and share its bolt pattern with many Audis, the Boxster, and the Cayman. The Carrera 4, Carrera 4S, Cabriolet 4, and Targa 4 use the G96/30 or G96/31, which are the same as the G96/00 and G96/01, but with an output for the front differential. You can convert these to RWD by just removing the differential and driveshaft. The front output can be left in place. 

For the 997 Carrera, Cabriolet, Targa, and S models, they came with the G97/01 transaxle. This has the same bolt pattern and is similar to the G96 transaxles, but is somewhat stronger. The Carrera 4, Carrera 4S, Cabriolet 4, and Targa 4 use the G97/31, which are the same as the G97/01, but with an output for the front differential. You can convert these to RWD by just removing the differential and driveshaft. The front output can be left in place.

All these transaxles can use the same adapter plate and flywheel, but will have different clutches. They are strong enough to handle 500whp well, and at most 600whp. If you want more power than that, especially using turbos, a supercharger, or nitrous, you will want to consider the other type of transaxle.

G96/50, G97/50, G96/88, G96/90, G96/96 (G50 Turbo Based)

The 996 Turbo and 997 Turbo use a version of the older G50 transaxle called the G96/50 and G97/50 respectively. The 996 GT2 and GT3 use a different version of a similar design, the G96/88, G96/90, or G96/96.The transaxles can take 800whp to 1000whp before breaking. The front diff may break with more than 700whp, but it can be removed to convert the car to RWD. All these transaxles can use the same adapter plate and flywheel as a G50, with different clutches.

 Adapter Plates and Flywheels

Stuttgart Muscle has adapter plates and flywheels available for non-turbo (Audi transmission based) 996 and 997 Porsches for LS based engines!

Adapter plate for 996/997 Non- Turbo

Flywheel for 996/997 Non-Turbo

 

Turbo and GT3 (G50 based) adapter plates and flywheels are now available!

Adapter plate for 996/997 Turbo/GT3

Flywheel for 996/997 Turbo/GT3

 Clutches

Technically, an OEM Porsche clutch will work with the custom flywheel, but it will not be able to handle the power of the V8. You are going to want an upgraded clutch and we recommend using SPEC clutches.

Porsche 996 1999 - 2001 Non-Turbo

Stage 1 Stage 2  Stage 2+ Stage 3 Stage 3+
Kit Part Number: SP641S SP642S SP643HS SP643S SP643FS

 Torque Capacity

(ft-lb at flywheel):

427 488 548 583 678

 

Porsche 996 2002 - 2004 Non-Turbo

Stage 1 Stage 2  Stage 2+ Stage 3 Stage 3+
Kit Part Number: SP901S SP902S SP903HS SP903S SP903FS

 Torque Capacity

(ft-lb at flywheel):

420 485 545 580 671

 

Porsche 996/997 2001 - 2008 Turbo and GT3

Stage 1 Stage 2  Stage 2+ Stage 3 Stage 3+
Kit Part Number: SP841-4 SP842-4 SP843H-4 SP843-4 SP843F-4

 Torque Capacity

(ft-lb at flywheel):

525 600 670 715 830