I just installed this so I don’t know the longevity, so I will chime back in on that. I found the oem for the same price elsewhere, but I needed it sooner and that’s why I purchased Dorman through prime. Dorman has been around for years and the warranty is great so I didn’t hesitate to purchase. For those with the 4th Gen 4Runner’s (03-09) take out the front two bolts holding the front diff arms in place and it will drop just enough to access the top two bolts. You will need to take out the bolt (12mm, the same as the actuator bolts) that holds the steering line to the crossmember which then allows you to take an extension and slide it under the line to get to the bolts. It will make sense when your under there.**Update**Worked for 3 weeks and quit. Had my wife turn the 4wd knob while I tapped the assembly and it started working again. Not sure why it got stuck, so I’m going to engage it daily/every other day for awhile. Will update later.