Page 1 of 21 1 2 3 4 5 11 ... LastLast
Results 1 to 10 of 205

Thread: GL-1 Gear Oil Alternative

  1. #1
    General mikew's Avatar
    Join Date
    Jan 2009
    Location
    edmond, ok
    Posts
    453
    Thanks
    76
    Thanked 295 Times in 119 Posts

    Default GL-1 Gear Oil Alternative

    I don't like GL-1 gear oil and wanted something "better" in my transfer case and transmission.

    GL-1 is hard to find, and finding one with a corrosion inhibitor is even harder!

    So I called my local HD truck driveline shop, Blumenthal's. They gave me the tech support phone number to Meritor, Rockwell's new name.

    I spoke with Meritor for awhile and this is what I learned.

    They recommend GL-1 with a corrosion inhibitor package, SAE 50W synthetic, or...

    SAE 30W, 40W or 50W motor oil that meets the CD spec.

    I asked, "You mean like 30W Rottella T diesel oil?" he said yep, you'll love it!

    Here's the lubrication document that covers all Meritor/Rockwell products and it includes T-136 transfer case info.

    http://www.meritorhvs.com/MeritorHVS_Documents/MM1.PDF

    We did not discuss the axels, but from this document they recommend a GL-5 lubricant for double reduction axles.

    If anyone knows the Rockwell axles part numbers for the Deuce I'd like to confirm they are listed as ones that use GL-5 before I switch.

    I'm off to Tractor Supply to get a 5 gal bucket of Rottella T to refill my transfer case that is sporting a brand new sprag in it!

    Mike W

  2. #2
    Colonel Snarky's Avatar
    Join Date
    May 2009
    Location
    Brazosport, TX
    Posts
    378
    Thanks
    19
    Thanked 48 Times in 27 Posts

    Default

    You can put what ever you want in the transfer case but the spicer transmissions and their yellow metal synchros get very angry if you don't put GL-1 in them, or something else that is yellow metal safe in them. The detergents and additives do unfortunate things to those pricey synchros, ask me how I know...
    Diesel Fitter

    "Zip ties the new duct tape."

    1971 Kaiser Jeep M35A2 with VIC-1
    1987 M105A2
    2001 Yamaha XT225
    2007 FJ Cruiser
    1999 Ford F-250
    2001 VW Golf
    1989 BMW 635i

  3. #3
    General mikew's Avatar
    Join Date
    Jan 2009
    Location
    edmond, ok
    Posts
    453
    Thanks
    76
    Thanked 295 Times in 119 Posts

    Default

    That's the thing, the transfer case has yellow metal syncros too. Meritor specifically warns not to use a GL-5 gear lube because it will eat yellow metal.

    Motor oil doesn't have the sulfur based additives that attack copper alloys but it does have lots of corrosion inhibitors.

    Many manual transmissions that have bronze syncros call for 30W motor oil.

    So what results did you have with motor oil in a Deuce transmission that went bad? What oil did you use?

    I'm feeling pretty darn safe about this, I'll report back with results.... in a few years!

    Mike W
    Last edited by mikew; 02-11-2010 at 18:54.

  4. #4
    4 Star General timntrucks's Avatar
    Join Date
    Feb 2006
    Location
    Ponchatoula LA
    Posts
    3,963
    Thanks
    1,767
    Thanked 959 Times in 429 Posts

    Default

    i get GL-1 at the local napa store .. right off the shelf
    Timntrucks

    1989 M925A2
    1970 XM816 w/w Jeep/Kaiser (1400s)
    1943 Ben Hur welding trailer
    1967 M105A2 Johnson Trailer
    1962 M105A2 Stevens metal enclosed
    1962 M101A2 Garwood trailer
    1960 M116A1 pioneer trailer
    196- M353 gen trailer
    196? M416 jeep trailer
    196? M105A2 aluminum flat bed
    1965 M332 Raven Shinnston ammo
    1965 M101A1

    19?? mkt



  5. The Following User Says Thank You to timntrucks For This Useful Post:

    powerhouseduece (02-16-2010)

  6. #5
    4 Star General jesusgatos's Avatar
    Join Date
    Jan 2009
    Location
    on the road - in CA right now
    Posts
    2,681
    Thanks
    439
    Thanked 261 Times in 202 Posts

    Default

    I'm running Amsoil fluids that are supposed to be compatible with yellow metals. No miles on Mah Deuce since I changed all the fluids though..
    no longer an active member on this forum

  7. #6
    3 Star General wdbtchr's Avatar
    Join Date
    May 2006
    Location
    St. Louis, MO
    Posts
    883
    Thanks
    273
    Thanked 137 Times in 86 Posts

    Default

    There is a thread on here from a couple of years ago n this very subject. There is a GL5 that is compatable with yellow metal, but I don't recall the details and don't have time to do a search for it right now.
    Alex B. - Son
    David Bryant (passed 08-13-201
    Kaiser Jeep M51A2 1965
    Kaiser Jeep M54A2 1967
    Dodge M37 1953
    International Cub 1958
    International Cub 1967
    Case 580 1968
    DTC 8606 Forklift

  8. #7
    Moderator WillWagner's Avatar
    Join Date
    Mar 2006
    Location
    Monrovia, Ca.
    Posts
    7,230
    Thanks
    124
    Thanked 1,915 Times in 927 Posts

    Default

    This has been covered many, MANY times. A search will yield oodles of hits. In a nutshell, read the label, if it is yellow metal compatable, you are good to go. IDK if i'd put 30wt motor oil in a vehicle that has the 26k capabilities, it might be a tad much for the lube.
    ASMH Volunteer

  9. #8
    2 Star General Jake0147's Avatar
    Join Date
    Oct 2007
    Location
    Panton, VT
    Posts
    782
    Thanks
    4
    Thanked 100 Times in 70 Posts

    Default

    MT-1 is the additional specification often tacked onto GL-5 that people say makes it backwards compatible. All I have ever found in that specification was specifically for non-synchronized boxes. Besides, if it were a backwards compatibility rating, why are certain GL-1 applications required to have GL-1 plus MT-1? It is inhibited a bit, but fully. I can't see filling my oil with stuff that my transmission can't make use of the benefits of, but is extremely susceptible to the side effects of, only to add more additives to counteract the additives I don't need... Oh well, who knows. I don't. I'll pose this question though, if more "improvers" are always better, what happened to GL-6?

    Napa has GL-1, usually in stock. That's what's called out in the TMs. Five gallon pails are the best value. 65-205 fits the TM recommendations, but it's dropped out of fancy for OTR trucks, it's not on the shelf there any more. The OEM recommendations from Spicer were for a 50 weight. If you're looking for a modernized upgrade to include R&O you can find that at the truck shops since (50W plus MT-1) in main stream use.
    Last edited by Jake0147; 02-11-2010 at 21:25.

  10. The Following User Says Thank You to Jake0147 For This Useful Post:

    danny81 (05-03-2013)

  11. #9
    General Westex's Avatar
    Join Date
    Jul 2009
    Location
    El Paso, TX
    Posts
    580
    Thanks
    39
    Thanked 63 Times in 39 Posts

    Default

    They've run for decades with GL-1.
    M923 5 TON
    M35A2 Hardtop
    M1061A1 Trailer
    Big Gooseneck
    Nike 34" Aluminum Baseball Bat
    Lots of mutilated softballs

  12. The Following User Says Thank You to Westex For This Useful Post:

    oldshep (12-31-2010)

  13. #10
    4 Star General glcaines's Avatar
    Join Date
    Jul 2009
    Location
    Hiawassee, Georgia
    Posts
    2,746
    Thanks
    1,725
    Thanked 1,205 Times in 550 Posts

    Default

    I use GL-1 in mine and I found it available at all of the local autopart shops, but it was less expensive at NAPA.
    Gary
    US Army 1970-1971 MOS: 11D20 (Scout)
    2/36th Infantry, 3rd Armored Division
    USAR 1972-1973
    MVPA: #32652

    2003 M1030M1 USMC Diesel Motorcycle
    1998 AM General M35A3 W/W and M66 Gun Ring
    1969 Kaiser Jeep M35A2 W/W (Sold)
    2000 M149A2 (USMC) Water Buffalo Trailer
    1968 Johnson M105A2 Trailer
    1992 M116A2 Trailer
    1987 XM1061E1 Trailer
    MEP-003A Gen Set
    30D36R 3 KW Gen Set ex-NC ANG (Sold)

Page 1 of 21 1 2 3 4 5 11 ... LastLast

Similar Threads

  1. Speedometer Adapter Leaking Gear Oil
    By onegmjack in forum The Deuce
    Replies: 71
    Last Post: 12-09-2015, 00:01
  2. GL-1 gear oil
    By ken in forum The Deuce
    Replies: 17
    Last Post: 03-13-2012, 23:25
  3. On Bypass oil filters - to get the small particles
    By OPCOM in forum Deuce Modification and Hot-Rodding
    Replies: 33
    Last Post: 06-29-2009, 00:17
  4. Replies: 6
    Last Post: 10-15-2007, 07:38
  5. IF YOU NEED GEAR OIL
    By red devils dude in forum The Deuce
    Replies: 6
    Last Post: 01-27-2005, 22:46

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •