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Front end grinding - ONLY while coasting in 4x4 high
It's been snowing on and off here in WI lately. I had to use 4x4 high twice in the last week on the highway; speeds around 30-40 mph. I noticed that when I would let off the accelerator, I would get a grinding noise (metal on metal whir) in the front end while coasting. Press the accelerator, noise goes away. It is less pronounced at lower speeds...so I just get passed the crappy parts on my drive, then switch to 2wd and white knuckle it slowly. (would rather do that then wreck something in the drive train)
I did a bit of interweb searching, but couldn't find much. A lot of "it's brakes", "it's u-joints", "it's CV boots" with no solutions....but it only happens in 4x4 high, while coasting. So those responses don't make sense to me. I have been driving with my hubs locked for 2 months now, no noise in 2wd with them locked.
What do you guys suppose? Could it be pinion bearings? How would I check those? (no experience there)
I'm thinking, I'll change my front differential fluid and strain for filings. I have search for a specific 6.4L tutorial, to no avail. Any of you guys do this before? Got pics or suggestions on the procedure?