We have a GD STI WRX here that was slipping with an auto box in it. We removed the auto and fitted a 6 speed manual and changed the rear diff and fitted a new clutch. Now its all back together and it still has almost no drive. it feels like the clutch is slipping but it should be good being a new complete kit. seems odd that 2 different transmissions one auto and one manual both seem to have the same issue. It moves under its own power but only just and the motor runs mint so not sure what to check next.
Anyone have a similar problem or know what to look at?