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Transfer case fluid change

Bobweb

Active member
101
160
43
Location
Morganton, Georgia
I am changing the transfer case oil. I’m not sure what the previous owner used In it. I have read all the different threads on different types/weights of oil. I have straight 30w non detergent oil already in bulk. My question is, will straight 30w burn up my transfer case? I’d like to use it if it is possible and won’t do damage but don’t mind spending the money if it really is that important to get a heavier oil. Although there is so much knowledge out there, I’m still not sure what to make of all of it. Any and all comments are welcome. Thanks

p.s. I have looked at the fluids chart frank8003 posted and it seems like 30w is close to 80/90?
 

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INFChief

Well-known member
721
1,343
93
Location
New York
I am changing the transfer case oil. I’m not sure what the previous owner used In it. I have read all the different threads on different types/weights of oil. I have straight 30w non detergent oil already in bulk. My question is, will straight 30w burn up my transfer case? I’d like to use it if it is possible and won’t do damage but don’t mind spending the money if it really is that important to get a heavier oil. Although there is so much knowledge out there, I’m still not sure what to make of all of it. Any and all comments are welcome. Thanks

p.s. I have looked at the fluids chart frank8003 posted and it seems like 30w is close to 80/90?
I would use a gear oil (GL).
 

kenn

Well-known member
170
513
93
Location
Texas
Hmm... I've been reading a ton of old threads on this very issue and it seems like the best advice is to use the original product in the LO 9-2320-209-12-1 . That would be, for most climates, 80/90 Gear Oil. I'm not sure on the GL1 vs GL5 specification as there is all sorts of conflicting information concerning yellow metal and sulphur. That said, MT-1 rated GL-5 is supposed to be OK. Orielly has their house brand, "Master Pro" which says GL5 and MT-1 right on the back and with a 20% off coupon is a pretty good deal. I just ordered that to do the transfers and transmission case. One lube rules them all.
 

ToddJK

Well-known member
1,312
4,464
113
Location
Sparta, MI
I would stick with gear oil for the transfer case for sure. You can also use that in the transmission as well, but Spicer did spec to use 40 SAE non detergent oil. Like Kenn said, the argument on which to use in other threads can be confusing, but as long as the lubricant is stated to be yellow metal safe, that's what's important.
 
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