Good oil for transfer case and diffs?
Good oil for transfer case and diffs?
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Joined: Sep 2000
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From: Southern California
The differentials use a multi-grade gear oil like 85w90 or 75w140 if you want to go synthetic. The transfer case will take Dexron/Mercon transmission fluid. Any good brand name that is readily available is fine. Even the house brand lubricants from the chain auto parts stores are good. Many are manufactured by the major oil companies and packaged under the chain stores' name.
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Junior User
Joined: Jan 2004
Posts: 77
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From: Salt Lake City
Thanks for the info, Im kinda new to broncos, this is going to be a very stupid question, but is the transfer case underneath where the front drive shaft goes into? That box looking thing?
Thanks again.
Thanks again.
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Joined: Sep 2003
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From: Florida Hill Country
Re: Good oil for transfer case and diffs?
Originally posted by hbronco
Just wondering what a good oil would be to use for the diffs and transfer case for my 79 bronco.
Cheers
Just wondering what a good oil would be to use for the diffs and transfer case for my 79 bronco.
Cheers
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Junior User
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From: Salt Lake City
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Senior User
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From: North Carolina
The owner's manual recommends transmission fluid, rather than gear oil for the transfer case regardless of which one you have. I run 80w/90 in my front diff, 75w/140 in my rear diff and synthetic ATF in my np205. I have a '78 Bronco.
Fleet Mechanic
Joined: Aug 2003
Posts: 1,546
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From: Kemmerer, Wyoming
sorry, I don't have an owner's manual for my '79.
So I used my shop manuals, which read:
Transfer Case...
Chilton - 30W or 50W (motor oil?), depending on the average temp
Haynes - 140W gear oil
both recommend 80W-90 gear oil in the diffs, and don't forget friction modifier if you have factory LS
I guess nobody really knows for sure what to run in the darn gearboxes... as long as there's some kind of lube!
As for me, I've always run 85W-140 semi-syn in the 4-sp tranny and t-case, 75W-90 full syn in the diffs. And I've no plans to change.
So I used my shop manuals, which read:
Transfer Case...
Chilton - 30W or 50W (motor oil?), depending on the average temp
Haynes - 140W gear oil
both recommend 80W-90 gear oil in the diffs, and don't forget friction modifier if you have factory LS
I guess nobody really knows for sure what to run in the darn gearboxes... as long as there's some kind of lube!
As for me, I've always run 85W-140 semi-syn in the 4-sp tranny and t-case, 75W-90 full syn in the diffs. And I've no plans to change.