2004 Honda Pilot EX 3.5L, V6, MFI, SOHC, Eng Desg J35A4, 3475 CC
Customer Concern: The vehicle came to the shop with a squeaking noise. Found the noise to be coming from the center support of the drive shaft. Pulled the drive shaft and sent it out for diagnosis and repair. After repair, it was re-installed but the noise was still there, but not as loud. Removed the drive shaft again and sent it back to the driveline repair shop who re-checked and re-did their work. The vehicle was returned to the customer but 400 miles later it came back with a vibration concern. When reaching 50 MPH, the vibration begins. You feel it in the seat like a massage chair and a droning noise is heard inside. Removed the shaft and test drove and found the concern gone. The drive shaft was sent it back to the driveline shop for a balance. They said the boot was torn on the center support because something hit it. We got it back and it's doing the same thing.
Tests: 1. Are the U-joints phased correctly? Put a small magnet bubble level on the front and rear U-joints. They should be parallel to each other.
Potential Causes: Driveshaft Phase
Confirmed Fix: Adjusted Driveshaft Phase