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Fox Resto
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  1. #1
    Authorized Vendor SPeace-ATL's Avatar
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    Default T-5 Internet Myth: Non-World Class T-5s use gear oil - UPDATED 01/09/2012

    This is one of the biggest myths on the Internet about the T-5.

    Even many of the pros get it wrong!

    Strangely enough, it seems that Borg Warner, left the decision about the lubricant up to the vehicle manufacturer...

    The first T-5s appeared in AMC vehicles. This includes certain models of Jeeps. AMC went traditional with the gear oil.

    Ford and GM soon followed with cars that used the T-5, but they both chose to go with Dexron-II ATF. This was BEFORE the World Class transformation was even created! (I will provide documentation to support this statement later in this post.)

    While using gear oil in a Non-WC T-5 will not damage it, putting it into a World Class T-5 will DOOM any synchro rings that are not made of either brass, or Carbon-Fiber! The gear oil would slowly dissolve the lining!

    The original WC synchros, or "blocker rings" for gears 1-4 were made of "paper", or sometimes it was called "fabric" as opposed to the traditional brass rings used up until this point.

    It was with the 1992 model year Mustangs that the WC T-5 recieved the Carbon-Fiber rings for third and fourth gears. The first and second rings did not receive the Carbon Fiber rings until July of 2011.

    With much confusion about what is and is not a "World Class" T-5 many people mistakenly put the gear oil in their 1985 and newer T-5s only to find them ruined a few months afterwards.

    Ok, the proof is in the original Ford service manuals printed in 1983 and 1984. The two years that Ford put Non-World Class T-5s in the Mustangs.

    Below are pages from those service manuals specifying the Dexron product!

    I want to give credit to a user called "FoxChassis" in the allfordmustang forum for providing these pages and convincing me that what I had read from trusted sources on the internet was WRONG.

    I also posed the question to my good friend, Paul at 5speeds.com who confirmed this. Paul also added that he was doing T-5 warranty work back in the early days and the Jeep T-5s had many more failures than the Ford and GM units due to the gear oil being used.

    Below are the pages from the Ford Service Manuals!

    UPDATE:
    I have received a copy of an email dated 01/09/2012 from a Support individual at Tremec who states that Tremec is presently recommending 30W MOTOR OIL for the NON-World Class T-5's.

    UPDATE 2:
    This update is not from Tremec, but comes from my personal experience in working with these transmissions.
    GM Synchromesh or the Pennzoil equivalent works well with the brass synchros in a NON-WC T-5. This fluid is also compatible with the lined synchro rings in a WC T-5. Some have reported better engagement of fifth gear in a WC T-5 using Synchromesh! Fifth gear is the only BRASS synchro in a WC T-5.
    Synchromesh works well for both WC and NON-WC T-5's.
    Last edited by SPeace-ATL; 03-11-2013 at 09:57 AM.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  2. #2
    Authorized Vendor SPeace-ATL's Avatar
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    Default

    UPDATE on the proper lubricant for a NON-World Class T-5:

    While the original lubricant specified for a NON-World Class T-5 (Ford and GM) was Dexron-II, Tremec is now recommending the use of 30W MOTOR OIL for these older transmissions.

    The original Dexron-II was discontinued in 1993 and replaced by Dexron-III. While Dexron-III "Meets or Exceeds" the specifications of the previous fluid, the viscosity is thinner. This "thinner" fluid is fine for a WorldClass T-5 with the lined synchro rings and tiny needle bearings under the mainshaft gears, but is a bit thin for the older NON-World Class transmissions.

    While Tremec may have previously recommended 50w Gear oil, they are now recommending 30w MOTOR OIL for the NON-World Class T-5's. This came in the form of an email from a support individual at Tremec dated 01/09/2012.

    WARNING: Be careful to NOT use Gear oil, nor Motor Oil in a World Class T-5, as it will damage the linings on the synchro rings.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  3. #3
    you know what i am saying 1loudmouthpony's Avatar
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    Default

    Regardless wether wc or not would 30 weight be good to run in any t5? Im trying to find a safe fluid that will would in either.. im not sure what t5 i have.. i dont remember seeing a tag.. but is there indications on the caseing?

  4. #4
    Authorized Vendor SPeace-ATL's Avatar
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    Good question. Glad you asked!

    The answer is no. 30w or especially Gear Oil will dissolve the linings on the synchro rings of a World Class T-5.

    If there is no ID tag on a tail housing bolt there is a way to at least tell if your transmission is World Class or not!

    This T5 Identification document is still a work in progress, but scroll down to the list of CASTING NUMBERS for the main case. The number will be cast into the side of the main case of the transmission. It is usually near the fill plug on the passenger side.

    http://www.Pro-ForcePerformance.com/...tification.htm
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  5. #5
    NOS is viagra for cars!!! Higherpowerraci's Avatar
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    ok so I just bought the Ford Racing M-7000-A. Any Idea what to run in it after the rebuild?
    65 coupe with a fox heart and legs under construction....
    93GT.
    68 Cougar.

  6. #6
    Authorized Vendor SPeace-ATL's Avatar
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    Quote Originally Posted by Higherpowerraci View Post
    ok so I just bought the Ford Racing M-7000-A. Any Idea what to run in it after the rebuild?
    That kit is for a world Class T-5.

    The closest match to the original Dexron-III fluid available today would be DEX/MERC Multi-Vehicle ATF. This is my recommendation. It is inexpensive and should be changed often!

    If you want a synthetic fluid, I recommend Mobil-1 Synthetic Multi-Vehicle ATF. Both of these fluids are readily available at most parts stores.

    Now, other fluids that people use and swear by are:

    Royal Purple SynchroMax
    GM SynchroMesh
    Pennzoil SynchroMesh

    There are others, but I can't think of them at the moment.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  7. #7
    IIIIIIIIIIIIIIIIIIIIIIIII
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    So we're talking about standard SAE30 oil that's used in air cooled engines?
    82 Capri 4.2/C5
    83 Notch NCSHP SSP 5.0/SROD
    83 Notch Street/Strip 5.0/T5
    94 Cobra #819 5.0/T5

    OTHER RIDES
    95 Ranger 4.0
    05 Lexus GX470 4.7

  8. #8
    Authorized Vendor SPeace-ATL's Avatar
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    Yes, Standard 30w Mptor Oil is what they specified.

    I don't see the relevance to "Air Cooled"

    My old Corvair was air cooled as was my VW Beetle, but many cars use 30w motor oil that are not air cooled...
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  9. #9
    Moderator Supporting Member jarhead's Avatar
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    PM sent SPeacer-ATL!!!
    MIKE




    As I lay rubber down the street, I pray for traction I may keep, and if I do begin to slide, please dear God protect my ride! - Amen!!!!

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