Transfer Case Fluid Vs Gear Oil

1980 Conventional transfer cases require SAE 80W or SAE 80W-90 GL-5 gear lubricant.

Transfer case fluid vs gear oil. In the old days transfer cases were filled with gear oil or automatic transmission fluid ATF but some modern transfer cases take specialty lubricants. The most obvious answer to this question is that gear oil is generally intended for use in manual gear boxes and transmission fluid is for automatic transmissions. 3172020 In most vehicles a transfer case is filled with a small amount of gear oil usually SAE 75W-85 80W-90 or 75W-140 grade.

2282020 Servicing is limited to oil changes at the recommended intervals. See the analysis and subsequent discussion here. The 75W is an updated formulation compared to the standard 75W-90 gear oil that was originally recommended in the 2015 and older Toyota Tacoma 4WD models.

I have looked extensively and find that GL4 is really hard to come by. The owners manual states that the transfer case fluid and manual transmission fluid should be 80W90 GL4 gear oil. Full time systems use SAE 10W-30 or 10W-40 engine oil.

So uncommon that the only 75w options available are the original OEM fluid and Ravenols SAE 75w manual transmission fluid. However as is always the case with automotive lubricants there are exceptions to this rule. Replacing this fluid at appropriate intervals can help prevent premature wear and damage caused by contaminated or broken-down fluid.

The fluid in the transfer case serves as both lubricant and helps to keep the internal components cool and turning smoothly. 392010 Automatic transmission fluid is a type of detergent oil that helps remove debris. The gear oil smells really bad.

My original 1973 manual says to fill it with 80w gear oil. Transfer case fluid is either synthetic or traditional gear oil but like many vehicles certain vehicles need certain types of transfer case fluids. 3312012 I have a 1973 Chevy truck with the NP205 gear driven transfer case.