This is a S13 welded differential for sale. I took an open differential off of a S13 and welded the spider gears. These welds are very good and will not break. We will take off the cover to show you how good the welds are. We are trying to sell the entire pumpkin for $75 obo. We will take out your old differential and install the welded one for an extra $100. PM me if you're interested. Thanks.