Extreme Terrain
4x4Wire Trail Talk Forums: Jeep, Toyota, Mitsubishi, Pajero, Isuzu, Kia, 4WD, 4x4, SUV, Off-Road and OutdoorWire Forums


Search

Recent Posts on TrailTalk
Happy Turkey Day
by OldColt - 11/26/21 02:15 PM
OG folks chime in!
by motero - 11/22/21 08:28 PM
JK Check Engine Light - P0300
by 4x4Wire - 11/17/21 09:08 AM
Montero Sport oil filter bracket
by rxinhed - 11/15/21 04:13 AM
1991 Diesel Swap
by rxinhed - 11/15/21 02:53 AM
Monty upgrade ideas wanted
by rxinhed - 11/15/21 02:51 AM
Meetings and things
by rxinhed - 11/06/21 02:50 AM
Support 4x4Wire
New Topics on TrailTalk
Happy Turkey Day
by rxinhed - 11/25/21 08:55 PM
1991 Diesel Swap
by guzzilapd - 11/11/21 03:49 PM
JK Check Engine Light - P0300
by 4x4Wire - 11/09/21 12:31 AM
Transmission Woes
by jdavis - 10/26/21 03:16 AM
Montero Sport oil filter bracket
by OldColt - 09/27/21 04:16 PM
1989 Montero AT to MT swap
by BrooklynOpus - 09/20/21 03:28 PM
4x4 Gallery
Photos of rig
Attila
99 Monterrible Sport
Scar the Cylon Raider
Mercenary Sergeant: Code Name "Sapphire"
More News on the 'Wire

4x4Voice
4x4Wire
MUIRNet-News
OutdoorWire
Who's Online Now
0 registered members (), 86 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums37
Topics138,247
Posts1,081,577
Members15,224
Most Online907
Dec 28th, 2019
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Transfer case oil, GL-4 only! #1101945 08/27/16 03:45 AM
Joined: Dec 2014
Posts: 26
marksroberts61 Offline OP
Getting the Wheeling Fever
I got curious about GL-4 and GL-5 since O'Reilly didn't carry GL-4 except for 140 weight, and I ran across this paper. It tells exactly why we don't want GL-5 in our xfer boxes. We might want this on the FAQ page.


The difference between gl4 and gl5 gear oils


1995 SR, dark blue, cloth seats, flare and cladding delete, upcoming sunroof delete,10 Guage custom skid plates, ham radio
Support our sponsors
Re: Transfer case oil, GL-4 only! [Re: marksroberts61] #1101951 08/28/16 03:34 PM
Joined: May 2000
Posts: 6,132
K
Kevin C Offline
Trail Leader
****
"Does that make them satisfactory for synchromesh or synchronized transmissions?"

The article addresses the issue with using GL5 in a synchronized gear box.

FYI On a GEN1 and GEN2 there are no synchronizers in the transfer case to have a wear problem with. There are bronze thrust washers. However, the loading and heat level are not sufficient to cause any problems. I have never had the transfer cases apart on the later models.

The transmission is a different story and GL5 can reduce synchro life.


87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...
Re: Transfer case oil, GL-4 only! [Re: marksroberts61] #1101952 08/28/16 07:57 PM
Joined: Dec 2014
Posts: 26
marksroberts61 Offline OP
Getting the Wheeling Fever
Better safe than sorry. The fluid specifications list GL-4 for the xfer box and GL-5 for the diffs, no 'or' notes that I've seen. Since the 4wd is shift on the fly, up to 65 mph, there must be some sort of synchronization going on. It's true that GL-5 is a better extreme pressure gear lube, as long as you have only steel components.

My main thrust was dissemination of information, and to warn people about the lubes that say they meet both specs, they do as far as extreme pressure goes, but are not safe for yellow metal.


1995 SR, dark blue, cloth seats, flare and cladding delete, upcoming sunroof delete,10 Guage custom skid plates, ham radio
Re: Transfer case oil, GL-4 only! [Re: marksroberts61] #1101954 08/28/16 09:07 PM
Joined: May 2000
Posts: 6,132
K
Kevin C Offline
Trail Leader
****
The original manual lists GL-4 or higher for both the transfer case and the transmission. There was a TSB in 1993 that corrects that callout for the transmission to Gl-4 only.

Again, for the transfer case its a non issue. I have been running Gl-5 in my transfer case since 1994 without any problem. That includes inspecting parts when I installed lower ratio low range transfer case gears about 12 years ago.

I'm going to go out on a limb here and say that If I haven't had a problem in 22 years, its probably safe. cool

You do bring up a good point that GL-5 is a problem in some applications.

"Modern EP gear oils contain thermally stable additives that promote system cleanliness and do not corrode yellow metals under moderate operating conditions. The goal in formulating top-tier EP gear oils is to develop additive chemistries that will carry high loads under boundary conditions and protect mating surfaces from wear while minimizing corrosiveness to yellow metals and keeping steel gear components clean."

Gear Oil EP additives

I have been running Redline 75-90 Gear GL-5 lube as well as Mobil 1. Same Redline in the front LSD and the rear Torsen. That simplifies what I need to keep on the shelf in the shop.


GL-4 GL-5 TSB reference



Last edited by Kevin C; 08/28/16 09:08 PM.

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...
Re: Transfer case oil, GL-4 only! [Re: marksroberts61] #1101960 08/29/16 07:51 PM
Joined: Jul 2003
Posts: 850
ES_97Sport Offline
Rock Warrior
*****
I accidentally put GL-5 into a '97 Montero Sport transfer case several years ago. When I drained the gear oil it looked like liquid gold. Needless to say that was the end of that transfer case. frown

Edward


'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 229:1
'99 Montero Sport Limited 4WD SAS 3-link project
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 4WD
Re: Transfer case oil, GL-4 only! [Re: marksroberts61] #1101961 08/30/16 01:36 AM
Joined: Jan 2002
Posts: 6,134
TOASTY Offline
Trail Leader
*****
We should have a fluid specification sticky


1999 Montero SAS'd on Kings and stuff

1998 Montero trying to get a V8 Swapped
Re: Transfer case oil, GL-4 only! [Re: Kevin C] #1101962 08/30/16 06:10 AM
Joined: May 2000
Posts: 6,132
K
Kevin C Offline
Trail Leader
****
Originally Posted by Kevin C
"Does that make them satisfactory for synchromesh or synchronized transmissions?"

The article addresses the issue with using GL5 in a synchronized gear box.

FYI On a GEN1 and GEN2 there are no synchronizers in the transfer case to have a wear problem with. There are bronze thrust washers. However, the loading and heat level are not sufficient to cause any problems. I have never had the transfer cases apart on the later models.

The transmission is a different story and GL5 can reduce synchro life.


Update... Until I can confirm I should have said no synchros in a GEN 1.


87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...
Re: Transfer case oil, GL-4 only! [Re: Kevin C] #1101969 08/31/16 11:11 PM
Joined: Jul 2003
Posts: 850
ES_97Sport Offline
Rock Warrior
*****
If I'm not mistaken, the Montero Sport 4WD '97-04 and the AWD '00-04 use the same transfer cases as the Montero Gen 2 and forward? I do know that all the Sport t-cases have syncros so I presume everything post-97 (at least) in the Montero has syncros.

I apologize for asking a stupid question, but what is the generational year boundary for the Montero?

Edward


'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 229:1
'99 Montero Sport Limited 4WD SAS 3-link project
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 4WD
Re: Transfer case oil, GL-4 only! [Re: marksroberts61] #1101984 09/02/16 08:15 PM
Joined: Dec 2014
Posts: 26
marksroberts61 Offline OP
Getting the Wheeling Fever
I understand that people are thinking that it's a corrosion problem, which it's not. The sulphur is buffered so as not to be corrosive. The issue is that the sacrificial boundary layer that forms with GL-5 (GL-4 forms one too, just not as strong) has a surface bond strength that is stronger than the brass itself, thus it is a physical erosion problem. The difference is irrelevant except if you have someone telling you its OK because they have had a synchro sitting in a glass jar of GL-5 for years and it's still ok, so the stuff is good to use. I wasn't aware of the TSB, makes you think about all of the comments here to the effect of "I'm not going to try to outguess the Mitsubishi engineers."


1995 SR, dark blue, cloth seats, flare and cladding delete, upcoming sunroof delete,10 Guage custom skid plates, ham radio
Re: Transfer case oil, GL-4 only! [Re: marksroberts61] #1102010 09/05/16 10:34 PM
Joined: Jul 2003
Posts: 850
ES_97Sport Offline
Rock Warrior
*****
Originally Posted by marksroberts61
... The issue is that the sacrificial boundary layer that forms with GL-5 (GL-4 forms one too, just not as strong) has a surface bond strength that is stronger than the brass itself, thus it is a physical erosion problem. ....


Which is why driving mine for two months left me with a catch pan full of brass particles and tiny flakes.

Edward


'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 229:1
'99 Montero Sport Limited 4WD SAS 3-link project
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 4WD
Page 1 of 2 1 2







4x4Wire Social:

| 4x4Wire on FaceBook |


OutdoorWire, 4x4Wire, JeepWire, TrailTalk, MUIRNet-News, and 4x4Voice are all trademarks and publications of OutdoorWire, Inc. and MUIRNet Consulting.
Copyright (c) 1999-2019 OutdoorWire, Inc and MUIRNet Consulting - All Rights Reserved, no part of this publication may be reproduced in any form without express written permission
You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
All corporate trademarks are the property of their respective owners.

Powered by UBB.threads™ PHP Forum Software 7.7.3
(Release build 20190728)
PHP: 7.2.34 Page Time: 0.032s Queries: 16 (0.009s) Memory: 2.8946 MB (Peak: 3.1636 MB) Data Comp: Off Server Time: 2021-11-29 11:54:30 UTC
Valid HTML 5 and Valid CSS