andyx187 Posted July 3, 2019 Share Posted July 3, 2019 How do I find out what diff I need to the back I have herd they need to match front and back with ratio ??? Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted July 3, 2019 Share Posted July 3, 2019 Look on the gearbox bellhousing near the starter motor, they're should be a ty### number on a white sticker . Give this a Google to find out the box's ratio then buy a diff with the same ratio . Other than ratio there's two main types of diff r160 all early classic and newage wrx 's / r180 later classic sti and newage sti's.If your unsure what r number the diff is give your year and model a Google to find out what should be in there . Quote Link to comment Share on other sites More sharing options...
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