The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-28-2004, 03:22 PM   #1
67cst
i love summertime
 
67cst's Avatar
 
Join Date: Jul 2002
Location: Kelowna BC
Posts: 4,302
atf in a transfercase? also rear end and xcase id pls

has anyone ever heard of using atf in a transfer case? my dad just bought a 72 chevy 3/4 ton 4x4 and is just going over everything...he said that the manual says to use atf in certain transfer cases...anyways the code on his xcase is:

1
C-99404
W

the 1 and W are in those places, above the C and below the 9

Also just out curious to the ratio in the rear end, the code off it is:

3934635 i might have a pic of it here if that helps

thanks, Derek
Attached Images
 
__________________
1967 shortbox stepside Chevy, 365 hp 327, th400.

GLOVE BOX LIGHTS FORSALE, click link for info

http://67-72chevytrucks.com/vboard/s...d.php?t=273724
67cst is offline   Reply With Quote
Old 11-28-2004, 03:24 PM   #2
67cst
i love summertime
 
67cst's Avatar
 
Join Date: Jul 2002
Location: Kelowna BC
Posts: 4,302
for some reason the xcase code all goes to the left margin, like i said above the w is below the 9...im sure this doesnt make any difference but i just dont want to miss anything

thanks again, Derek
__________________
1967 shortbox stepside Chevy, 365 hp 327, th400.

GLOVE BOX LIGHTS FORSALE, click link for info

http://67-72chevytrucks.com/vboard/s...d.php?t=273724
67cst is offline   Reply With Quote
Old 11-28-2004, 04:21 PM   #3
PICKMUP
"Trucks with Class"
 
PICKMUP's Avatar
 
Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,158
I think our TCs use 90W gear oil. Synthetic might even be better. ATF may have been used in some later model applications.
If you run 90W or equivilent and ATF shows up in your TC, it shows you that the seal went out in your adaptor between trans & TC...a common problem...trans gets low & TC gets over full. Always change that seal if you have one apart.
__________________
Email: frankeham@comcast.net
Phone: 360-956-7170
PICKMUP is offline   Reply With Quote
Old 11-28-2004, 04:51 PM   #4
4x4Poet
Registered User
 
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
As long as the 72 still has the original NP205 transfer case, the Chevrolet Service manual states:
TRANSFER CASE: "...Use SAE 'GL-5' gear lubricant, and follow the 'Gear Lubricant Viscosity Table' for proper viscosity gear lubricant to be used during vehicle operation."
REAR AXLES: "...when necessary, refill to level of filler plug hole using 'GL-5' gear lubricant as shown in the 'Gear Lubricant Viscosity Table.'"

So, it's GL-5 all the way. For manual trans too. Now to viscosity:
Gear Lubricant Viscosity Table
Below 10ºF: SAE 80
Up to 100ºF: SAE 90
Above 100ºF consistently: SAE 140

I use Amsoil synthetic GL-5 90W in both my NP205s and in all my pumpkins. In my manual trans, I use Redline's synthetic GL-5 MT90 for the additives they use to make the synchros work not too stiff, not too loose. The axle you pictured looks like an Eaton H052. It probably has 4.11 gears. If you remove the diff cover to change the oil, count the ring & pinion gear teeth and calculate the ratio.
__________________
'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

Last edited by 4x4Poet; 11-28-2004 at 04:53 PM.
4x4Poet is offline   Reply With Quote
Old 11-28-2004, 04:37 PM   #5
Robert1970C20rstbukt
Registered User
 
Robert1970C20rstbukt's Avatar
 
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
Where'd you find the numbers on the rear end? I have the same rear end in my truck and I never found the numbers yet. Oh that is one of the Corporate(Eaton) rear ends, Chevrolet used those in trucks from like 47-72.
__________________
RJD

1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 350/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 478M V6/5 spd winch truck
Robert1970C20rstbukt is offline   Reply With Quote
Old 11-28-2004, 05:23 PM   #6
67cst
i love summertime
 
67cst's Avatar
 
Join Date: Jul 2002
Location: Kelowna BC
Posts: 4,302
thanks guys
__________________
1967 shortbox stepside Chevy, 365 hp 327, th400.

GLOVE BOX LIGHTS FORSALE, click link for info

http://67-72chevytrucks.com/vboard/s...d.php?t=273724
67cst is offline   Reply With Quote
Old 11-28-2004, 06:35 PM   #7
1969 GMC
Registered User
 
1969 GMC's Avatar
 
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
Derek, on both of the Eaton centersections I have, the gear ratio is stamped into them on the side. Its actually the # of teeth on the ring and pinion. 7/36 is stamped on one (5.14) and I forget what the 4.57 one says.

I am guessing 4.11 should be 9/37
__________________
1969 GMC K2500
1996 Honda Accord
2007 Kawasaki KLR 650
1969 GMC is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:05 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com