NP203 Oil
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Fleet Mechanic
Joined: Aug 2004
Posts: 1,311
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From: Nevada
NP203 Oil
Coming across conflicting information on NP203 oil viscosity recommendation 
Haynes book is saying 140w gear oil, other web sources are saying don't you dare use heavy gear oil, but use 10-40w motor oil.... 
The stuff it leaks looks to me like a 10-30ish motor oil...... And I know there are numerous different setups for the 203, mine being divorced with axles and grease zirks as far as the eye can see 
.... Any input is appreciated, I will keep poking around the web ........
Haynes book is saying 140w gear oil, other web sources are saying don't you dare use heavy gear oil, but use 10-40w motor oil.... The stuff it leaks looks to me like a 10-30ish motor oil...... And I know there are numerous different setups for the 203, mine being divorced with axles and grease zirks as far as the eye can see .... Any input is appreciated, I will keep poking around the web ........
Postmaster
Joined: Nov 2011
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FWIW the scales for engine oil and gear oil are different. SAE 90 gear oil has viscosity properties close to SAE 40 engine oil.
I don't know correct lube for a 203... but the conflicting recommendations are not so different in terms of viscosity.
I don't know correct lube for a 203... but the conflicting recommendations are not so different in terms of viscosity.
Moderator & parts slinger
Joined: Feb 2007
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From: S/W Missouri, Polk county
That xfer case set up it a "sling lubed" and you need a thinner oil. So yes motor like 10W30 and NO 80/89 gear lube like a normal NP-205 or Dana 60 uses.
Also at least one a month lock it in 4wd and drive it on NON hard backed surfaces for a bit. Dirt, gravel, sand, mud, what ever is fun.
Talk about it..https://www.bobistheoilguy.com/forum...Number=1610032
Good info here! New Process 203 Transfer Case Tech: Off-Road.com
NP203 case lube? - Off-Road Forums & Discussion Groups
Also at least one a month lock it in 4wd and drive it on NON hard backed surfaces for a bit. Dirt, gravel, sand, mud, what ever is fun.
Talk about it..https://www.bobistheoilguy.com/forum...Number=1610032
Good info here! New Process 203 Transfer Case Tech: Off-Road.com
NP203 case lube? - Off-Road Forums & Discussion Groups
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Fleet Mechanic
Joined: Aug 2004
Posts: 1,311
Likes: 31
From: Nevada
Sweet
Awesome info, thanks for the links 
Wanted to add some more links for anyone else poking around for NP203 infos
http://ramchargercentral.com/vehicle...plug-location/
http://www.fourwheeler.com/how-to/47538/
Wanted to add some more links for anyone else poking around for NP203 infos
http://ramchargercentral.com/vehicle...plug-location/
http://www.fourwheeler.com/how-to/47538/
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