Transfer Case Sludge
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New User
Joined: Aug 2010
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Transfer Case Sludge
I recently decided that the noise from the transfer case (divorced NP205) needed to be addressed. I'm in the process of fixing the truck after it has sat for 10 years. I opened the drain plug and a thick sludge tried to make its way out. I ended up taking off the rear covers of the transfer case. It is currently cold outside so the sludge is slowly making its way out. Is there a good way to flush this stuff out. I have read that running ATF through as a flush might work. Any other suggestions? Also, what should I fill it with when I'm ready?
Thanks!
Thanks!
Senior User
Joined: Feb 2010
Posts: 252
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From: Tualatin OR
Ive always just drove the truck for a bit before i drained it to get it goood and warm. It flows better that way. And these old trucks call for a pretty thick gear oil in the transfer. I know most people on here use 80-90w gear oil or 85w140 gear oil. I use 85w140 gear oil and it works great. I also use it in my diffs. Happy draining!
Junior User
Joined: Jan 2011
Posts: 57
Likes: 0
From: Tigard, OR
Id have to agree with the warming it up. Cruise up the freeway an exit or two then back. Worked well for me. I know my tranny(4 speed) and my transfer had atf runnin in it from the po. I don't think he was just flushin it either >_>
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