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 > General Truck Forums > All 4x4 Tech & Off Roading

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-14-2008, 12:45 PM   #1
mothertrucker424
Registered User
 
mothertrucker424's Avatar
 
Join Date: Sep 2006
Location: st pete
Posts: 404
t case oil??

this may sound stupid but i have heard a 205 take either ATF or gear lube

which is correct and what weight oil/atf should i use?
__________________
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-

1972 K10 4"lift 33"tires (soon to be bigger and better)
2000 silverado 1500 2wd 2"coil spacers3" BL 285/75/16's
mothertrucker424 is offline   Reply With Quote
Old 02-14-2008, 12:49 PM   #2
Dads 68 GMC
Registered User
 
Dads 68 GMC's Avatar
 
Join Date: Feb 2006
Location: Sidney; MT
Posts: 172
Re: t case oil??

you can use either one, I use 80/90 gear lube,I think it would be a little quieter than atf. synthetic would probably be great.
Dads 68 GMC is offline   Reply With Quote
Old 02-14-2008, 02:50 PM   #3
hdflstf
Registered User
 
hdflstf's Avatar
 
Join Date: Oct 2007
Location: Desert Southwest
Posts: 540
Re: t case oil??

From what I have seen, GM recommends gear oil for earlier years and then changes to ATF in later years for the same transfer case. Gear oil in mine.
hdflstf is offline   Reply With Quote
Old 02-14-2008, 10:59 PM   #4
Stocker
20' Daredevil (Ret)
 
Stocker's Avatar
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,548
Re: t case oil??

I've also heard either is OK, but I run gear oil... However, when the seal between the trans and t-case was leaking, ATF would be pumped into the t-case. When the trans needed topping off, it was time to drain the excess from the t-case. Having both oils in there never hurt it at all...
__________________
- Mike -

1972 K20 LWB 350/350/205

RIP El Jay
Stocker is offline   Reply With Quote
Old 02-14-2008, 11:42 PM   #5
1969k10stepside
Registered User
 
Join Date: Mar 2006
Location: USA
Posts: 21,020
Re: t case oil??

I use gear oil in my np205.The only way mine will have atf in it is if the seal was letting it leak in..

Last edited by 1969k10stepside; 02-14-2008 at 11:47 PM.
1969k10stepside is offline   Reply With Quote
Old 02-14-2008, 11:50 PM   #6
Wreckless_71
Registered User
 
Wreckless_71's Avatar
 
Join Date: Apr 2007
Location: Kelso, WA
Posts: 363
Re: t case oil??

I guess I'm the only guy running ATF then, eh... Well the General recommends that you use ATF in the transfercases on all newer models, I consulted my dad who has been a mechanic for almost 30 years and he said to run the ATF, on the other hand I do have a 250 gallon tank of gear oil in the shop so I could've done either or.
__________________
1972 K10 4" lift, 35’s, 383 stroker, 700r4, current project.
1971 C10 3"/5" static drop, 355/350. "La Bamba.” The current daily driver.
Wreckless_71 is offline   Reply With Quote
Old 02-15-2008, 12:05 AM   #7
cobinder
Everything is work in progress
 
cobinder's Avatar
 
Join Date: Apr 2006
Location: Denver Colorado
Posts: 326
Re: t case oil??

I run what ever is in the tranny. Auto tranny run ATF, NV4500 run syn, Manny tranny run gear oil. The 205 is a tough TC, she don't really care as long as it's plentiful and clean.
__________________
Good luck with your truck!



How much?! It's just an old truck part!!


49 International on a 80 GMC 3/4ton 4x4 chassis
48 International KB-5 2 ton dump bed
04 Honda CRF "500"
09 Honda CRF450 fuel injected rocket
03 Suzuki hayabusa carbonfiber wheeled monster.
02 Ford diesel stretch van (toy hauler)
01 38' Monaco diesel pusher motorhome
cobinder is offline   Reply With Quote
Old 02-15-2008, 08:39 AM   #8
mudmilitia
Registered User
 
mudmilitia's Avatar
 
Join Date: Jan 2007
Location: ontario ny
Posts: 31
Re: t case oil??

Gear oil here!
mudmilitia is offline   Reply With Quote
Old 03-05-2008, 02:31 AM   #9
Duro5341
Registered User
 
Duro5341's Avatar
 
Join Date: Dec 2006
Location: Earth
Posts: 239
Re: t case oil??

synthetic ATF in my NP208......230,000kms all original....going strong.

GM recommends dex III ATF in the NP208, so run it.....

Duro
__________________
-1986 K10 LWB, 350 HD,TH400
3.08, 30 spline 10 bolt, with an Auburn Posi, 31" tires
All original, second owner truck
-1979 Monte Carlo, 350, 200r4, 3.73 posi
-1987 GT T-top Mustang - slow moving project
Duro5341 is offline   Reply With Quote
Old 03-08-2008, 07:01 PM   #10
MJN
Registered User
 
MJN's Avatar
 
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 2,980
Re: t case oil??

NP205's run 80w90 since it's an all gear t-case. You can use 85w140 also.
__________________
'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
MJN is offline   Reply With Quote
Old 03-08-2008, 07:45 PM   #11
Burt4x4
Registered User
 
Burt4x4's Avatar
 
Join Date: Feb 2000
Location: Modesto, CA
Posts: 1,842
Re: t case oil??

yup, I am with the 80-90 gear oil crowd. I have the SM465/NP205 combo both filled with 80-90w
__________________
1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks
Burt4x4 is offline   Reply With Quote
Old 03-08-2008, 11:11 PM   #12
jaros44sr
Registered User
 
jaros44sr's Avatar
 
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,443
Re: t case oil??

Mine was running ATF, not by choice, seals let go Since my 205 has gears in it, I plan to run gear oil, heavier the better, JMHO
__________________
Semper Fi...Uncle Sam, you da man

All parts offered to help are free, unless otherwise noted

Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training
SAFETY FIRST

AS usual, off topic

They say your mind goes second, can't remember the first


Jim
jaros44sr is offline   Reply With Quote
Old 03-09-2008, 02:50 AM   #13
Hoods69BadBowTie
Chevys Kick A$$
 
Hoods69BadBowTie's Avatar
 
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
Re: t case oil??

Yea I agree 205 should be 80/90 gear oil. I got ATF fluid in my 208.
__________________
*HOODS is what I answer too*
-'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold
-'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit
-'86 K5 Blazer Silverado 6.2 4" lift 35"s
-'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's
-'83 Monte Carlo T-Tops. 126,500 Original Miles
-LATER
I would rather push a Chevy then drive a ford!!
Hoods69BadBowTie is offline   Reply With Quote
Old 03-09-2008, 04:01 AM   #14
muscletrucks
Registered User
 
muscletrucks's Avatar
 
Join Date: Mar 2008
Location: Kansas City
Posts: 431
Re: t case oil??

Gear oil, recommended by dealer parts department.
muscletrucks is offline   Reply With Quote
Old 03-30-2008, 10:38 AM   #15
Dooley
Registered User
 
Dooley's Avatar
 
Join Date: Mar 2005
Location: North Coast
Posts: 1,012
Re: t case oil??

Quote:
Originally Posted by mothertrucker424 View Post
this may sound stupid but i have heard a 205 take either ATF or gear lube

which is correct and what weight oil/atf should i use?
When I had my 1972 it called for 80/90 gear lube in the 205.
When I had my 1980 it called for 30w motor oil in the 205.
My 1988 V 30 calls for ATF in the 205.
They all work.
Dooley is offline   Reply With Quote
Old 01-17-2012, 05:34 AM   #16
69CST4x4SWB
Registered User
 
69CST4x4SWB's Avatar
 
Join Date: Sep 2010
Location: Oregon, The Beautiful Pacific Northwest (GOD'S country)
Posts: 151
Re: t case oil??

Quote:
Originally Posted by Dooley View Post
When I had my 1972 it called for 80/90 gear lube in the 205.
When I had my 1980 it called for 30w motor oil in the 205.
My 1988 V 30 calls for ATF in the 205.
They all work.
I think it is due to tighter clearances in newer TC's and tranny's, that is why thinner fluids are used in them. If you tried putting 80/90 in your 1988 you would have a hard time shifting it.
__________________
In GOD I Trust All Others I Question!!!
1969 Chevy CST K/10 SWB (Legs)
1969 Chevy C/20 LWB (Old Gray Mare) Donor
1972 GMC 1500 Sierra Grande (Orange Creamsicle) Sold
1979 Chevy C/30 Cheyenne Flatbed Dually (FatBoy) Sold
1991 Chevy Silverado Ext Cab (LowBoy) Sold
2008 Harley Davidson Electra Glide (Black Betty)
Mark ~ US ARMY VETERAN 2nd ARMORED DIVISION 67th ARMOR
69CST4x4SWB is offline   Reply With Quote
Old 01-17-2012, 12:49 PM   #17
coops714x4
Registered User
 
coops714x4's Avatar
 
Join Date: Mar 2011
Location: Cement Oklahoma
Posts: 916
Re: t case oil??

My 205 has ATF, when I redo my truck I am going to change tranny, currently it has a SM465 and I am going to swap in a NV4500 then I will run synthetic. alot of older truck from the north will have ATF in them, that way they could shift the TC easier when cold.
__________________
1971 K20, Coop's beast (project)
1972 C30 wrecker, "Big Ernest" (SOLD)
1975 K5 Blazer (wife's toy) she got it in the divorce
2014 Street Glide Special
1983 K20 Big Block, auto (work horse)
coops714x4 is offline   Reply With Quote
Old 01-22-2012, 03:00 AM   #18
Dooley
Registered User
 
Dooley's Avatar
 
Join Date: Mar 2005
Location: North Coast
Posts: 1,012
Re: t case oil??

Quote:
Originally Posted by mothertrucker424 View Post
this may sound stupid but i have heard a 205 take either ATF or gear lube

which is correct and what weight oil/atf should i use?
My 1972 called for 80/90 gear oil in the case
My 1980 called for 30w motor oil in the case
My 1988 calls for ATF in the case.
They all work in a 205.
Dooley is offline   Reply With Quote
Old 01-22-2012, 03:10 AM   #19
72lb4x4
Account Suspended
 
Join Date: Jul 2006
Location: DFW
Posts: 1,427
Re: t case oil??

Interesting resurrection...

Did these 72, 80, and 88 supposed callouts specify the TC? 72 is 205; 80 may be 203 or 205; 88 may be 205 or 208.

I think a 208 uses ATF and I don't know what a 203 wants.

So it seems to be more complicated than ATF is good for all...
72lb4x4 is offline   Reply With Quote
Old 01-22-2012, 03:18 AM   #20
67swb72klb
Registered User
 
67swb72klb's Avatar
 
Join Date: Dec 2010
Location: livingston co.mi
Posts: 2,452
Re: t case oil??

mine was filled with atf by the p/o i took the check plug out and it was 3qt over filled drained all of it and replaced with 80-90
__________________
California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project
67swb72klb is offline   Reply With Quote
Old 01-22-2012, 03:22 AM   #21
Dooley
Registered User
 
Dooley's Avatar
 
Join Date: Mar 2005
Location: North Coast
Posts: 1,012
Re: t case oil??

Quote:
Originally Posted by 72lb4x4 View Post
Interesting resurrection...

Did these 72, 80, and 88 supposed callouts specify the TC? 72 is 205; 80 may be 203 or 205; 88 may be 205 or 208.

I think a 208 uses ATF and I don't know what a 203 wants.

So it seems to be more complicated than ATF is good for all...
The info I posted is correct for a 205 transfercase.
There were no GM 203's in 1980.
My 1988 V30 has the factory 205. I bought these trucks new.

Pics are from my 1980 K and my 1988 V30 truck owner manuals. Nothing supposed here.
Attached Images
  

Last edited by Dooley; 01-22-2012 at 03:36 AM. Reason: added pic
Dooley is offline   Reply With Quote
Old 01-22-2012, 10:33 AM   #22
Stocker
20' Daredevil (Ret)
 
Stocker's Avatar
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,548
Re: t case oil??

Quote:
Originally Posted by 67swb72klb View Post
mine was filled with atf by the p/o i took the check plug out and it was 3qt over filled drained all of it and replaced with 80-90
That sure sounds like bad seals between the trans and the t-case... has it been OK since you put gear oil in?
__________________
- Mike -

1972 K20 LWB 350/350/205

RIP El Jay
Stocker is offline   Reply With Quote
Old 01-22-2012, 12:51 PM   #23
67swb72klb
Registered User
 
67swb72klb's Avatar
 
Join Date: Dec 2010
Location: livingston co.mi
Posts: 2,452
Re: t case oil??

Quote:
Originally Posted by Stocker View Post
That sure sounds like bad seals between the trans and the t-case... has it been OK since you put gear oil in?
yes none so far they must have filled it up on a bench i dont know how they got that much in it
__________________
California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project
67swb72klb is offline   Reply With Quote
Reply

Bookmarks


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 02:51 AM.


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