My problem started last night. I had drove my 1997 Nissan Pathfinder in 4wd. I switched it back to 2wd and parked it. When I took off again, in 2wd, it started making a very loud grinding noise that got louder the faster I went. I put the truck back in 4wd and the noise completely stopped. I'm at a loss on what I should do!!!
Grease ur differential ur rear end get underneath find all ur grease zerts and ask a shop how to grease ur rear end
SOURCE: surging and loud whistling noise
Sounds like a vacuum leak. Check all vacuum hoses on the intake, throttle body, etc. Sounds like one cracked or came off. Post back if you have any questions. Hope this helps.
SOURCE: Transfer case is making a grinding noise in 2wd,
Depending on how long the grinding has been going on, the IWE ( integrated wheel ends ) might need to be replaced.
The problem that causes the symptoms is either cracked vac lines from the IWE solenoid, or a faulty IWE solenoid.
Check the vac lines to the IWE, this is the block diagram of the setup
Use a visual inspection and vac tester ( might vac with a gauge on it ) to test the lines.
Testimonial: "great! It was cracked vacuum lines. Thanks for the feedback!"
SOURCE: 2004 F150: When in 2wd the front end makes a noise like a rat...
I had this problem too. It could be a few different things but all the same result, loss of vacuum causing the 4wd to start to engage but not completely. The teeth on the clutch in the locking hub are grinding on the spline of the cv shaft as you lose vacuum and it tries to go into 4wd which is the default if everything would fail. 1st thing could be either of the 4wd locking hubs (approx $200 ea., located on the back side of each front spindle), check them to make sure the vacuum lines on the top of it are still attached these require the brakes, tie rod and upper ball joint to be removed if replacing, 2nd is the 4wd vacuum actuator (approx. $40 located on the firewall passenger side behind the battery) Ford has replaced this part with a modified one that has a little roof on it to stop the water that drips of the hood when it rains and makes it short out, this is very easy to replace (2 nuts) and last if both the above are working just fine would be to trace all the vacuum lines for a break unfortunately it is a 6-8 foot line for all the front 4wd and it costs approx. $100 if you have to replace. Not very difficult just time consuming. Hope some or all of this helps.
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