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Really grasping at straws to cling to the GL-5 is bad for you myth? The statement was that GL-5 is the cause for the gear to fail, and they redesigned the gear several times... but that mean old GL-5 simply will not lubricate the gear as well as GL-1 did. BULL HOCKEY. Unless you have some...

MT-1 is the 'Yellow Metal Safe' designation. It actually means 'Manual Transmission' Spec number 1. Really. GL-5 has been yellow metal safe for decades. Originally there was an issue with water, sulphur and heat above 250F. Any tranny/transfer with an operating temp above 250F requires...

You should reread his post: " GL-5 is not adequately lubricating the 2nd gear's bearing when the truck is going fast in 5th gear. The gear has been modified a couple of times to improve things, as evidenced by the variety of differently designed gears found in actual transmissions, but it...

A design issue.. the transmission is a splash system. A change in the casting or some other device to enhance the flow of lube would solve it. It GL-5 isn't getting splashed to the right spots, neither is GL-1. They have the same viscosity (80-90) and other than some additives are the same...

"Remember, the Army had to go to Rockwell to get these made, they couldn't have done it themselves." The Army kills people and blows things up. They don't make vehicles, ammo or gasoline. When originally produced Rockwell said use GL-1 (or whatever the MIL-SPEC for GL-1 was, then it was...

* API Categories GL-1, GL-2, GL-3 and GL-6 were declared inactive by SAE Technical Committee 3 in 1995, even though oils may be marketed with these designations.

Mertior never made the transfer cases..they were a result of buying rockwell. So other than some Army support contracts they have little new to say. The Mertior documents for the transfer case are simply (wait for it) original ROCKWELL documents! I can't see how people can demand 'standards'...

Buuutttt... These ARE NOT Meritor built trannys! They are Rockwell units that originally used GL-1, then GL-5. The only reason Meritor lists them is because they got them via acquisition. Even the Manual (MM3.pdf) that they refer to in the 2010 MM1.pdf is a straight up Rockwell document...

It is a convoluted mess. Please re-read pages 176-179 and see what I mean. Within those 3 pages it says: Meritor does not approve petroleum-based and multiviscosity oil. Use only SAE Grade 50W synthetic oil in the transfer case. * Do not use multi-viscosity (i.e., 80/90W) GL-5 gear oil...

GL-1 does not exist. Napa et al is selling an oil that cannot by GL-1 becuase the NGLI does not recognize it as such. In order to be called a certain specification, it has to be tested by an authorized testing center. The NGLI web says says that GL-1 cannot be tested because the machines that...

http://www.meritorhvs.com/MeritorHVS_Documents/MM3.PDF Here is the 1987 Rockwell (logos and all) transfer case disassembly guide. For lube type, it references Rockwell Field Maintenance Manual #1. Who has FMM1 or are you going to say that http://www.meritorhvs.com/MeritorHVS_Documents/MM1.PDF...

So my 76 parts manual lists the transfer case as a Rockwell. That clears that up, the site has some older information (maybe get an update?). So, Meritor buys Rockwell. Whats the Meritor PN for the Rockwell T-136 transfer case? PLUS if you reread the MM1 pdf it CLEARLY shows the that the 'no...

I did find this: 1997 Rockwell International spins off its automotive business, creating Meritor Automotive. Then 2011 ArvinMeritor completes the divestiture of its light vehicle business in January 2011 and officially changes the name of the company back to Meritor - signifying a...

Ok, Page 176 is the chapter header. Page 179 (that people are saying is proof to not use GL-5 does not specify in any way the T136 transfer case. Meritor != TImken. Part numbers are not matching up. What is the Meritor TC number of the case installed in my 66? Again, how are you guy...

Because improper information is being put out. The original transfer cases were Timken T136-21 Sprag Type; Timken T136-27 Air shift The original transfer cases, since the mid 80's have run GL5 with absolutely no problem. Now everyone is reverting to PRE-1980's GL-1, or even more funny...

But you are using Manufacturer 'B's instructions for Manufacturer 'A's gear. On top of that, the M35 transfer case does not get 250F+ to warrant synthetic oil. PLUS you are not realizing the history of 20+ years of GL-5 oil in 300,000+ trucks. You are not ignoring anything, you simple have it...

You post a random scrap of paper and yell "EUREKA!". First, this is NOT an ARMY LUBE ORDER. I don't think the Army is going to dump every gallon of GL5 they have over your random scrap of paper. SECOND, please read page 176, or for those that missed itL: Most Meritor transfer cases can...

What does it say? Post the page.

I said this two or three pages ago. Since the mid 80's the US ARMY HAS BEEN DUMPING GL-5 oil into M35s and the manufacturer has no problem with it. Sure its a much heavier duty oil than it *needs* but one lube is easier to make than 2. *ORIGINALLY* GL-5 oil did have an issue with yellow...

I hope it didn't seem like I was attacking anyone, its just that after 5 pages of posts I cannot even get to the source of where this GL-1 oil came from. If it is in a TM, its over 20 years old. I think if GL-5 based LO was going to rot a driveline it would do it by now. If you feel the...