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01-09-2010, 09:15 PM
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#1 |
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Active Member
 
Join Date: Jan 2004
Location: East Texas
Posts: 380
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Oil Type for 4X4 transfer case-78
I have a 3/4 ton 4X4 78 Chevy truck that has the original driveline, 400 small block, 400 tranny etc. I'm not sure what type transfer case it has, but it is a full time 4 wheel drive (no lockouts).
Reading the owner's manual it says 80w90 for part time and 10W30 or 10W40 for full time transfer case. I'm confused and sure don't want to put the wrong weight oil in it. Any insight on this? Thanks, Lane.
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Lane 1979 Chevy SWB- (Second owner- Father in Law was first) 1979 Chevy Silverado SWB-Red/Red |
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01-10-2010, 12:08 AM
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#2 | |
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Registered User
Join Date: Dec 2009
Location: MI
Posts: 111
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Re: Oil Type for 4X4 transfer case-78
Quote:
If the shifter says 4H, 2H, N, 4Lo, it is the Np 205. I highly doubt it has the 205, as those were reserved for the true 1 tons and manual transmissions. So 10w 40 is fine for the NP203. If you want any more info, check near the front drive shaft somewhere, should be either a round tag or rectangle one saying "New Process Gear" with a model number.
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-Josh "Mr. Simpson, there are thousands of people like you with no discernible talent." Duff World Records Division "Yeah, they're called Congress!!" -Homer Simpson |
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01-10-2010, 09:57 AM
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#3 |
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Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: Oil Type for 4X4 transfer case-78
http://www.chuckschevytruckpages.com/drivetrains.html This might help for identification.
If you want to know the oil, try the "smell" test. If it's 90w in there now it will be like "bad" milk. You won't wonder about the smell, it will kinda smack you in the face, lol. (you'll definitely be able to tell the difference) From what you've posted, it "should" be 10w-30, or 40.
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold  )I'm kinda like duct tape- no real purpose, but handy to have around. |
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01-10-2010, 12:09 PM
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#4 |
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Watchin the rust grow
Join Date: Oct 2008
Location: Western Nebraska
Posts: 950
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Re: Oil Type for 4X4 transfer case-78
I put straight non-detergent 30weight in mine just the other day.
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1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done  2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold
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01-10-2010, 11:51 PM
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#5 |
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Active Member
Join Date: Jan 2004
Location: East Texas
Posts: 380
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Re: Oil Type for 4X4 transfer case-78
Thanks to the great advice on this thread (and the links provided), I discovered my transfer case is a full time NP 203 case. I added 10W40 motor oil. Appreciate the help. Lane.
__________________
Lane 1979 Chevy SWB- (Second owner- Father in Law was first) 1979 Chevy Silverado SWB-Red/Red |
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