They may not be LSD's in the Crosstrek or the Impresa. It's VERY important to get the build sheet with the engine/trans assy. for the one you buy. Also the CPU that it came with. If it dosen't have LSD, they are available from several sources. I thought it was interesting that the Subaru unit is welded shut and the gears are not replaceable. If it's bad, you buy a new unit. That's about all I know. Someone else can surely help you more................Bruce