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Changing differential fluid - A step by step "HOW TO"

Discussion in 'Technical Chat' started by brianr, Jan 21, 2009.

  1. Apr 25, 2013 at 4:14 PM
    #1341
    rtn1911

    rtn1911 Well-Known Member

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    You could weld a nut to it or get after it with a chisel.
     
  2. May 7, 2013 at 6:29 PM
    #1342
    Waikoloa Tacoma

    Waikoloa Tacoma Well-Known Member

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    Both the local dealer and NAPA use/recommend/sell Valvoline SYN Power full synthetic 75w-90 for limited slip. Both say no additives needed. Only difference is $33 at dealer, $16 at Napa.

    Edit: More content.
    Just finished mine. Took 3.2 qts for mine. The lower plug was a breeze to loosen. The upper plug was a very different story. Used 6 point socket with standard 1/2 inch drive, damn near had an aneurysm trying to loosen it. Went to my impact next, 1st setting - nothing, 2nd setting - nothing, third setting - finally broke loose. Whoever did it last must have had an 800 pound gorilla jump up and down on a 5 foot beaker bar to tighten it. Good lord!
     
    Last edited: May 7, 2013
  3. May 8, 2013 at 10:50 AM
    #1343
    jmarquez808

    jmarquez808 Large Member

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    lmao i usually bust out my breaker bar or a socket wrench with a big pipe for stubborn bastards like this! or my 600lb gorilla, hes usually big enough for the job. lol
     
  4. May 8, 2013 at 11:25 AM
    #1344
    Waikoloa Tacoma

    Waikoloa Tacoma Well-Known Member

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    Yeah I usually pull out the breaker bar as well but with the impact I am directly in front so less chance of rounding off the corners.
     
  5. Jun 10, 2013 at 6:42 AM
    #1345
    Janster

    Janster Old & Forgetful

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    Changed my diffs again yesterday for the 2nd time.

    First time, was at 26,000 miles (3 years ago). Used Mobile 1 75W-90 and 2 bottles Ford XL3 friction modifier.

    Yesterday, 59,400 miles and 6 years later. Mobile 1 75W-90 and 1 bottle of XL3 so far. It grumbled almost immediately within the first mile or so until I was able to do my 'diff mixing routine' several times. We'll see what happens after I drive it for a few days.

    It's still a *mystery* with Mobile 1 LS compared to 3 years ago and today. This is the one negative thing about Mobile 1 - is that they can't (or don't want to) explain themselves for their 'advertising' of this oil and how confusing it is. Until you actually change your oil and run a diff mixing routine (drive in tight circles / 8's in both directions) -you really and truly don't know how much friction modifiers you'll need.

    The front diff oil was still translucent and only slightly dirty. The rear was darker than the front ....but neither of them were nearly as dark/dirty as the OEM fluid I removed 3 years ago. Both magnets had a similar amount (small film) of material on them.

    OH yeah, and Thanks to my local Toyota Dealer - who couldn't give me the right part I needed for the front diff drain plug gasket and I discover this after draining it. I just re-used the old one. They gave me two rear gaskets.... The front drain is a bigger and copper looking.
     
    Last edited: Jun 10, 2013
  6. Jun 14, 2013 at 10:17 AM
    #1346
    brucejoh

    brucejoh B/CS Tacoma

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    I know the book says 3.12 Qts. or something like that but mine just took 4 qts. of Lucas 75w90. When I checked the level with my finger it was just at the bottom of the fill hole. Is it bad to have this much fluid in my diff? should I drain some out? Is it possible to overfill and cause damage?

    This was my first diff fluid change on my 2010 TRD Pre runner.

    Thanks.
     
  7. Jun 20, 2013 at 5:39 PM
    #1347
    T Fades

    T Fades Well-Known Member

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    Sub'd for the answer to this.

    This seems similar to the final drive on my m/c. Supposed to drain, then fill till it starts coming out of the fill hole. In essence, cannot overfill the m/c. Wondering if it is the same for the Taco.

    Thanks.
     
  8. Jun 21, 2013 at 3:07 AM
    #1348
    george3

    george3 Well-Known Member

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    There is probably an official answer but I filled mine til it came out. It was more then it is supposed 2 B. I was worried but its been months now and no problem.
     
  9. Jun 21, 2013 at 5:57 AM
    #1349
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The manual states that over filling the diff, can cause the oil to "froth" or foam up, thus causing the gears to over heat.
     
  10. Jun 21, 2013 at 6:15 AM
    #1350
    george3

    george3 Well-Known Member

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    Good info. Thanks Chris.
     
  11. Jun 21, 2013 at 6:28 AM
    #1351
    DheadTaco

    DheadTaco Pill it till you kill it!

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    Now you can begin to refill your differential! You should add your LSD additive sometime between your first and second quart of gear oil.

    If I have a 2WD PreRunner do I still need to add this additive?

    When filling, the oil will begin to run out at some point. Put the plug in the fill hole, and let the gear oil run down into the lenght of the axle shaft. After a few minutes, remove the plug and begin to fill again.

    What is the quantity of oil that it call for to put in?
     
  12. Jun 21, 2013 at 6:28 AM
    #1352
    Janster

    Janster Old & Forgetful

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    Was your truck on level ground?

    If you were parked with the nose pointing downhill - your essentially over filling it.
     
  13. Jun 21, 2013 at 6:30 AM
    #1353
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Only if you have a mechanical LS Diff, as indicated by the sticker on the axel, as in the pic in the first post.
    and it takes 3 quarts.
     
  14. Jun 21, 2013 at 6:30 AM
    #1354
    TACO TX

    TACO TX Well-Known Member

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    Did you take into account the amount left in each quart. I use a pump and have about a quarter quart left in each jug so there for it wilm take 4 quarts to get 3.12qt's.
     
  15. Jun 21, 2013 at 7:02 AM
    #1355
    Janster

    Janster Old & Forgetful

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    FOR Mechanical LSD only
    It's been several days....but I had to add 1/2 bottle of friction modifier to prevent the diff from rumbling for a total of 1.5 bottles.

    Even though Mobile 1 says they put friction modifier in the 75W-90....it's not much - if any at all.
     
    Last edited: Jun 21, 2013
  16. Jun 21, 2013 at 7:07 AM
    #1356
    Frogsauce

    Frogsauce Well-Known Member

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    Is adding the friction modifier typical? I am about to change mine, so should I just add the fric modifier to the bottles as I am filling up the diff?
     
  17. Jun 21, 2013 at 7:11 AM
    #1357
    Janster

    Janster Old & Forgetful

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    I'm pretty certain...you do not have a mechanical LSD. I think they stopped after 2008 model year.

    The only time you need friction modifier is if you have the mechanical LSD.
     
  18. Jun 21, 2013 at 7:12 AM
    #1358
    TACO TX

    TACO TX Well-Known Member

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    Mobile 1 says LS compatible, not that it has friction modifier in it. You still have to add modifier to it. 2009 and up do not require LSD additive.
     
  19. Jun 21, 2013 at 7:14 AM
    #1359
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    janster pointed out that there is another Modil 1 Gear oil that says the addative in in the bottle.
     
  20. Jun 21, 2013 at 7:23 AM
    #1360
    Janster

    Janster Old & Forgetful

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    Some of the bottles actually say "Friction Modifier Included".

    When I tried to get bottles without the 'Friction Modifier Included' - the sales guy tells me... "It's all the same part number".
     
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