Review on ACDelco GM OEM Rear Wheel Speed Sensor, Part Number 20938121 by Josh Long

Ideal for OEM. I had to tap with a hammer. Be sure to apply high-temperature wheel bearing grease to the sensor housing. The old sensor was more difficult to remove than it should have been due to corrosion. PB + Torx 30 Light Blaster with 3/8" ratchet w/ extension + flat head screwdriver + curved needle nose pliers + gentle twisting/pulling worked well. It's an easy task, but not a quick one. Take your time to avoid the problem.