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  1. #201
    Member 136 Rep Points babyivan's Avatar
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    Quote Originally Posted by Intuit View Post
    Unlike the DMF and axles, the differentials are internal to our transmissions.
    So, all being one unit, the fluid is shared and the axles are lubed by the trans fluid. I'm talking specifically about the spline end that goes into the trans. The trans was noisier with less fluid.
    2017 Magnetic, w/Recaros

  2. #202
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    Quote Originally Posted by KKaWing View Post
    https://www.redlineoil.com/mt-lv-70w75w

    ^ Redline's to spec trans fluid
    To avoid confusion, the weight in the original link is 70/75.

    In reference to higher weights, being GL-4 also, I find this interesting...
    Quote: MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears
    https://en.wikipedia.org/wiki/Spiral...r#Hypoid_gears
    Quote: ....... Special gear oils are required for hypoid gears because the sliding action requires effective lubrication under extreme pressure between the teeth. ....... Hypoid gearings are used in power transmission products that are more efficient than conventional worm gearing.[citation needed] They are considerably stronger in that any load is conveyed through multiple teeth simultaneously. By contrast, bevel gears are loaded through one tooth at a time. The multiple contacts of hypoid gearing, with proper lubrication, can be nearly silent, as well.

    https://www.redlineoil.com/mt-85-75w85-gl-4-gear-oil
    LV usually designates 'low viscosity', ULV 'ultra low viscosity'.
    I didn't locate an 'LV' designation on the higher weights.
    Hmm.....
    2016 Ford Fiesta ST Kona Blue ; Engine, Suspension will remain untouched ; Southwest Ohio ; Winter: 215/45R17 Continental ; Seasonal: 205/40R17 Bridgestone

  3. #203
    Senior Member 397 Rep Points danbfree's Avatar
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    Quote Originally Posted by M-Sport fan View Post
    It seems that all of the DCT fluids out there, maybe save for the Red Line, and possibly a very few others, are semi-synthetic only.
    Triax (on Amazon) meets Ford spec and is full synthetic DCT fluid...
    '17 Magnetic - black wheels/red calipers - New Feb, '18.
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  4. #204
    Senior Member 397 Rep Points danbfree's Avatar
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    Quote Originally Posted by Intuit View Post
    You're aware that the axles aren't lubricated by the transmission fluid any more than the dual mass flywheel is.

    The OEM fluid has a good reputation. No one has ever claimed that it has ruined or contributed to the demise of any transmission.

    My prior manual shift vehicle ran on ATF, and I stuck with that over the course of my 327k ownership, never experiencing a single issue out of the internal transmission. The stuff I pulled out between 100-130k (too long ago - don't recall) was in such perfect condition in both appearance and feel, level, that I decided it won't be necessary to mess with it again for the life of the vehicle.

    The full synthetic replacement fluid I selected seemed thin too. (which isn't surprising, being a full synthetic) But it wasn't downright watery like the non full synth DCT stuff that came out between 20-30k on the ST. I don't know how it looked going in, but its appearance coming out wasn't exactly confidence inspiring, nor was its feel. Never noticed any issues (like stiff shifter or additional noises) on the full synth replacement during the course of the most frigid Winter months.
    Was that the Triax that meets Ford spec? Just curious... it seems more and more it's the fluid level and not a specific fluid that can cause issues...
    '17 Magnetic - black wheels/red calipers - New Feb, '18.
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  5. #205
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    Quote Originally Posted by babyivan View Post
    So, all being one unit, the fluid is shared and the axles are lubed by the trans fluid. I'm talking specifically about the spline end that goes into the trans. The trans was noisier with less fluid.
    Though they make contact, the splines aren't truly lubed by the fluid. If there's any slop in that connection, they should to be replaced.
    2016 Ford Fiesta ST Kona Blue ; Engine, Suspension will remain untouched ; Southwest Ohio ; Winter: 215/45R17 Continental ; Seasonal: 205/40R17 Bridgestone

  6. #206
    Member 136 Rep Points babyivan's Avatar
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    Quote Originally Posted by Intuit View Post
    Though they make contact, the splines aren't truly lubed by the fluid. If there's any slop in that connection, they should to be replaced.
    Everything is lubed from the fluid. I don't understand what you mean.
    No issues with slop
    2017 Magnetic, w/Recaros

  7. #207
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    Quote Originally Posted by danbfree View Post
    Was that the Triax that meets Ford spec? Just curious... it seems more and more it's the fluid level and not a specific fluid that can cause issues...
    My own take based on the Just-Auto interview with Getrag, the only reason our B6 doesn't require the same full-synth that the iB5 does, is because we have a dual-mass flywheel. There are a lot of variables (such as the differential) and that could be wrong.

    To be clear, GL-4 is *NOT* listed as B6 compatible. B6 uses the DCT. Per Ford, their own fluid used with iB5 is GL-4 compatible.
    2016 Ford Fiesta ST Kona Blue ; Engine, Suspension will remain untouched ; Southwest Ohio ; Winter: 215/45R17 Continental ; Seasonal: 205/40R17 Bridgestone

  8. #208
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    Quote Originally Posted by babyivan View Post
    Everything is lubed from the fluid. I don't understand what you mean.
    No issues with slop
    It is far, far, far, far, far, far, far, far, far, far, far, far more likely that the clack was generated from some part of the differential, versus the splines on the axle shafts, which are not apart of the differential. Splines are not like the other gearing in the transmission. The splines under normal operation don't experience shear or slip. It is a static connection. It's like saying you need to make sure that the connection between the output shaft and the gear that slides onto it stays lubricated. If there's slop, then there's already a problem. The only way a fluid fill could have an impact with the axle splines is if there is already slop in that connection; which there shouldn't ever be; at 0 miles or 500,000 miles.
    2016 Ford Fiesta ST Kona Blue ; Engine, Suspension will remain untouched ; Southwest Ohio ; Winter: 215/45R17 Continental ; Seasonal: 205/40R17 Bridgestone

  9. #209
    Member 57 Rep Points maestromaestro's Avatar
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  10. #210
    Member 136 Rep Points babyivan's Avatar
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    Quote Originally Posted by maestromaestro View Post
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