transfer case fluid - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RICHARD MORGAN · 02-17-2004, 12:13 AM

what kind of fluid do you guys put in your transfer case? gear oil or trans fluid?

**Yukon Jack** · 02-17-2004, 12:17 AM

I believe there are some transfer cases that use trans fluid, but the ones common in our years, the Rockwell T-221, NP205 and Dana 20 all use gear oil.

Blue_71 · 02-17-2004, 12:18 AM

80W90 gear oil in the t-case, manual trans, and front and back diffs

**Yukon Jack** · 02-17-2004, 12:28 AM

That is what I use too. I did try the Lucas gear oil when I swapped out my trans for a 4 speed and put new seals in the transfer case.

fast14 · 02-17-2004, 12:46 AM

I have also heard of people draining the gear oil out of their transfer cases and replacing it with transmission fluid. Don't know the pros and/or cons of it cuz they are still running with no problems but maybe somebody else does.

FRENCHBLUE72 · 02-17-2004, 01:37 AM

80 -90 here too...

da-burb · 02-17-2004, 01:40 AM

Mostly use tranny fluid in the Northland. The gear oil is just too stiff at -30. Any place with above freezing temps could easily use gear oil.

1969 GMC · 02-17-2004, 02:20 AM

i am using 90w gear oil, and my truck is starting to go through it like crazy. i hope my transmission to transfer case adapter hasn't cracked. everytime i drive my truck, the oil will warm up and gush out, and leave a puddle the size of a basketball. is there anything thicker i can use?

**kwmech** · 02-17-2004, 03:56 AM

Quote:

Originally posted by 1969 GMC
i am using 90w gear oil, and my truck is starting to go through it like crazy. i hope my transmission to transfer case adapter hasn't cracked. everytime i drive my truck, the oil will warm up and gush out, and leave a puddle the size of a basketball. is there anything thicker i can use?

Where is the oil gushing from? sounds like a venting problem to me or an over fill.

Hooter · 02-17-2004, 04:02 AM

my np208 in my ford calls for tranny fluid, and so does the np245 tranny, it used to have 80w 90 in it but I couldnt shift the damn thing for the life of me when it was cold outside, gave my right arm a real good workout though

1969 GMC · 02-17-2004, 04:33 AM

Quote:

Originally posted by kwmech

Where is the oil gushing from? sounds like a venting problem to me or an over fill.

nope it is neither. last week i almost ruined the transfer case because there was next to no lube in it. made a hideous clanking noise so i topped it off. now its ok. i have heard that the rockwell cases leak, but this is horrible. i will have to check it every week, or even more often depending on how big my puddles are. if i just drive a short distance, it will be fine, but after a long drive i get the puddles (which all of my drives are).

02-17-2004, 12:13 AM	#1
RICHARD MORGAN Registered User Join Date: Jan 2004 Location: HERNDON VA Posts: 216	transfer case fluid what kind of fluid do you guys put in your transfer case? gear oil or trans fluid?

02-17-2004, 12:17 AM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,687	I believe there are some transfer cases that use trans fluid, but the ones common in our years, the Rockwell T-221, NP205 and Dana 20 all use gear oil. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

02-17-2004, 12:28 AM	#4
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,687	That is what I use too. I did try the Lucas gear oil when I swapped out my trans for a 4 speed and put new seals in the transfer case. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

02-17-2004, 12:46 AM	#5
fast14 Registered User Join Date: Nov 2003 Posts: 117	I have also heard of people draining the gear oil out of their transfer cases and replacing it with transmission fluid. Don't know the pros and/or cons of it cuz they are still running with no problems but maybe somebody else does. __________________ Just a little crazy 1970 chevy full size half ton, soon to be one ton running gear, 350 turbo, 205 case, 355c.i.

02-17-2004, 01:37 AM	#6
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	80 -90 here too... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

02-17-2004, 01:40 AM	#7
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Mostly use tranny fluid in the Northland. The gear oil is just too stiff at -30. Any place with above freezing temps could easily use gear oil. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

02-17-2004, 02:20 AM	#8
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	i am using 90w gear oil, and my truck is starting to go through it like crazy. i hope my transmission to transfer case adapter hasn't cracked. everytime i drive my truck, the oil will warm up and gush out, and leave a puddle the size of a basketball. is there anything thicker i can use? __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

02-17-2004, 04:02 AM	#10
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	my np208 in my ford calls for tranny fluid, and so does the np245 tranny, it used to have 80w 90 in it but I couldnt shift the damn thing for the life of me when it was cold outside, gave my right arm a real good workout though __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.