Popping sound
#1
Popping sound
I have a strange popping/rubbing sound coming from my 99 expedition when I place it in 4H or 4L. It made the sound right from the get go either in a straight line or turning. I thought it was the cv joints but after looking at them figured it wasn't.
I have replaced the transfer case oil and the rear diff plus put in 3 tubes of friction mod. This has seemed to help some but the sound still shows up under hard acceleration in a straight line or once the truck gets up to speed, then it sounds like a pretty constent knock until i let off the gas. When I let off the gas it makes a erratic knocking sound then will go away until i build up speed or turn. When in 2 wheel I have heard the sound maybe twice but it was while turning and that was it. Mind you this has all been in the snow/ice so far to date.
Is there anyway to determine if its the transfer case or just a crappy diff? I am out of ideas so any input would be great, thanks guys!
I have replaced the transfer case oil and the rear diff plus put in 3 tubes of friction mod. This has seemed to help some but the sound still shows up under hard acceleration in a straight line or once the truck gets up to speed, then it sounds like a pretty constent knock until i let off the gas. When I let off the gas it makes a erratic knocking sound then will go away until i build up speed or turn. When in 2 wheel I have heard the sound maybe twice but it was while turning and that was it. Mind you this has all been in the snow/ice so far to date.
Is there anyway to determine if its the transfer case or just a crappy diff? I am out of ideas so any input would be great, thanks guys!
#2
#3
I should have mentioned it has the brown wire mod, so the clutches are not being used. If it is the drive chain how can I go about checking that and what is the parts breakdown. I have a haynes but that dont say crap about the transfer case! Thanks, I am really hoping it isn't the transfer case, but who knows!
#4
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cbaum17
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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12-29-2012 01:38 PM
1999, acceleration, expedition, f150, ford, makes, making, navigator, noise, poping, popping, sound, transfercase, truck, turning