jancie ... 6/7/2011
2003 Lincoln Navigator Base 8 Cyl 5.4L
Steering & Suspension
There is a humming in the back end. What is it?
While riding I can hear a loud humming in the back of car. Some say it's the rack and pinion and other say it's the back end. Help what is it?
The rack and pinion suggestion is referring to the steering - this would be located in the front of the vehicle. Does the noise change in pitch, or get louder / softer with speed? Have you checked the rear differential lubricant level? Try the 'Diagnose' tab on this page to assist to describe the problem.