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Old 02-16-2021, 02:27 PM   #1
Accelo
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Join Date: Mar 2015
Location: washington
Posts: 2,211
Re: Transfer Case Grinding in 4WD

I am sure automatic transmission fluid will hurt anything.
Early Dodge 4 speeds required automatic transmission fluid.
Nothing I know of that was built in the last decade uses 90W.
Even the differential requires synthetic in my 21 year old Silverado.
However, using the 90 will reduce the leakage. The speedometer fitting is a know leak.
Glad you got it figured out.
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