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01-13-2003, 03:05 PM
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#1 |
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Registered User
Join Date: Oct 2002
Posts: 27
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What fluid in NP203???
So what kind of fluid goes in this thing? I do have a part-time kit in it. Thanks.
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01-13-2003, 03:56 PM
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#2 |
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Registered User
Join Date: Oct 2002
Location: Oregon
Posts: 69
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The service manual calls for 30W. If your running a part time kit, make sure you put it in 4x4 at least 1 time every to weeks and drive a few hundred feet. This puts oil back in the rear output shaft bearing area.
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01-16-2003, 12:21 AM
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#3 |
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Registered User
 
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 2,967
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my book says 10w40
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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01-16-2003, 04:09 AM
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#4 |
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Workaholic
Join Date: Oct 2002
Location: Katy, TX
Posts: 1,589
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10W40 in mine too.
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1979 K-10 Silverado (work in progress) 1991 V1500 Subruban 1999 Suburban LT 4x4 2006 Suburban LTZ (daily driver) |
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01-16-2003, 10:44 PM
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#5 |
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Registered User
Join Date: Oct 2002
Location: michgan
Posts: 57
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thats what the books say i run 80 90 in mine have been for 3 years hasent gave me no problems the oil just dont seem thick enough to me
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79 4x4 short box |
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01-21-2003, 03:36 AM
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#6 |
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Registered User
Join Date: Jan 2003
Location: Verona, PA
Posts: 23
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30wt,40wt,80w90,it all works,throw some Lucas oil stabilizer in,that will make any gearbox work smooth.
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01-21-2003, 12:20 PM
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#7 |
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Registered User
Join Date: Aug 2001
Location: anaheim, ca
Posts: 187
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203s all use 10W40. I have an NP205 in my 88 crewcab dually, and it uses ATF!!! I thought about putting gear oil in there instead, but that's what the factory put in, and they have just a tad bit more engineering experience than me, so I left the ATF in it.
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ken '58 Chev NAPCO 4x4 short '60 GMC Suburban 4x4, restored '60 GMC 3/4T stepside 4x4 '64 GMC Suburban 4x4, restored '90 Chev Suburban 4x4, dually, ZZ502 '77 GMC Suburban 4x4, one ton axles, 12" lift, 39.5"s '88 Chevy crewcab dually 4x4, 10" lift, 42"s (x6!) '03 Jeep Wrangler Rubicon '79 Chev 3/4 Suburban 4x4, 400-400-203 |
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01-21-2003, 12:50 PM
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#8 |
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Registered User
Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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10w40 in a 203
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