I replaced the solenoid in my front ELSD but I did it with the front differential out of the vehicle. It took only a few minutes to swap in the new one. As far as doing it with the differential installed in the vehicle I couldn't tell you. If you can get the diff cover off and get up in there I'm sure you could probably swap it out while it's still in the vehicle. I'm just not sure if there is enough room to get in there.