Originally Posted by lanrith
Don't you need to swap both the front and rear differential becauses of the Final Drive Size Difference? Looking into going with a Legacy Tranny for my 98rs but the final drive ratios are way different.(4.11-3.9)
This whole thread is full of misinformation.
You do not need to swap the ECU. There is no such thing as a M/T or Auto ECU. They are identical, you just have to ground the correct wire to tell the ECU that it's connected to a M/T Trans.