A part commonly pulled out and replaced on our e30’s are the differential fluid plugs. We designed this plug set to aid in the ease of performing maintenance on our differentials as well as increase the longevity of the plugs. These plugs feature a 19mm external hex to simplify removal as well as reduce the chance of stripping the internal hex on the factory units. The drain plug features a 1/8 – NPT thread to allow the use of a temperature sensor. These plugs are tailored to the E30 Medium Case Differential covers which utilize a M22 X 1.5 thread. These plugs can likely be used in any housing featuring the same thread.
These plugs are fully CNC machined from solid 4130 and then zinc plated to increase corrosion resistance.
The plug set includes both an upper (fill) and lower (drain) plug as well as a new crush-washer set and a 1/8 – NPT plug for use in blocking the Temperature Sensor port if unused.