Precision-molded gear differential situation with 38T pulley and cover produced from tough composite item. Employed by #309401 ââ¬â XRAY X4 Gear Differential. The diff instance features tiny bleeding holes the M2.5x8mm screws to allow extra oil to empty away. The form associated with diff instance was indeed updated, for a much more centered backside gear place that improves dedication & forward traction.