[Tireiron]

Solid answers here...

The 07&08 Spec B tranny would be a great swap for the SVX if you are OK with not having some of the 6MT features. The Spec B DOES NOT have a front LSD or DCCD.

The Spec B tranny would allow you to use the SVX rear R160 diff. It is a 3.9 final drive however it has a 1.1:1 center diff which allows the use of the 3.54 SVX rear diff. You will also be able to use the SVX auto driveshaft with the Spec B tranny. And if you get the front tranny stub shafts, c-clips, and left and right seals from the 04 6MT STi (available from the dealership, about $150 for all) you can use the SVX front axleshafts.

The gear ratios in the Spec B tranny are absolutely beautiful for the extra torque of the H6 motor. They have the best gear spacing and the tallest 5th and 6th gear.

All other factors will be the same from swapping auto to 6MT. Clutch and pedals, shifter, tranny mount will all still have to be fabbed up to work.

This swap is on par with the 06-07 STi 6MT for parts required. It is the most minimal swap there is as almost all drivetrain parts from the SVX can be retained. Again, the only thing you will not get is a front LSD or a DCCD center diff.

Any further questions ask away and I will check back.