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Rear diff groan/moan after fluid change.

Discussion in '2nd Gen. Tacomas (2005-2015)' started by brian92s, Aug 17, 2022.

  1. Aug 17, 2022 at 10:59 AM
    #1
    brian92s

    brian92s [OP] Well-Known Member

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    Hello!

    I changed the 3 quart rear differential on my 2006 Prerunner 2WD double cab a few days ago and noticed today that on harder turns at low speeds in either direction, it sounds like a groaning sound is coming from the rear diff. Being this is the only thing I've done other than tighten the spare tire up a little firmer since never noticing this issue, I am assuming something is up with that. I drained the oil at roughly 127.5k miles and it was pretty dark/thick as well as some decent metal shavings on the drain plug magnet. I put 3 fresh quarts of Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil till it dripped out the fill hole, new crush washers, torqued it to 36lbs fill/drain and off I went. Now I am noticing this noise and wondering what I should do. Should I use some sort of additive/thickener if the gears are worn from potentially this being the first gear oil change? Should I be using a thicker oil all together instead? Thanks!

    Amazon link to gear oil used:
    https://www.amazon.com/dp/B08K9CGB6Y?ref=ppx_yo2ov_dt_b_product_details
     
  2. Aug 17, 2022 at 12:03 PM
    #2
    blue_runner

    blue_runner Well-Known Member

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    SR-71A likes this.
  3. Aug 17, 2022 at 12:04 PM
    #3
    brian92s

    brian92s [OP] Well-Known Member

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    @blue_runner thank you very much, I will go ahead and do that! I was also unsure if I needed to do this since the fluid claimed to have the additive, puts me at ease!
     
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  4. Aug 17, 2022 at 12:19 PM
    #4
    brian92s

    brian92s [OP] Well-Known Member

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    @blue_runner I should also ask how much of the bottle you added to the 3 qt rear diff? Thanks!
     
  5. Aug 17, 2022 at 12:29 PM
    #5
    blue_runner

    blue_runner Well-Known Member

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    It's been a little bit since I did it, but I think I used around 2.5 quarts plus the additive.
     
  6. Aug 17, 2022 at 12:31 PM
    #6
    brian92s

    brian92s [OP] Well-Known Member

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    awesome, thanks for the quick response and easing my headache!
     
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  7. Aug 18, 2022 at 5:27 PM
    #7
    brian92s

    brian92s [OP] Well-Known Member

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    @blue_runner update: I drained all the synthetic fluid, and added 1 whole bottle of the suggested Friction Modifier Positraction Additive for Limited Slip Differentials by Yukon. I also, after reading on many other threads/forums, found many people had issues with synthetic fluid in their Taco's rear LSD and opted to go with conventional 80W-90 just for a little added weight as well. The noise immediately went away after driving off from changing the fluid out. I will keep this thread informed if this issue doesn't come back so others know to either not use synthetic all together, or at least add an additional bottle of LSD friction modifier to it EVEN IF it has claims of containing the additive already.

    Another note: I drove with the Valvoline synthetic for about 120 miles, there is still a weird "popping noise" occasionally on acceleration/braking and turns, hard to say as I only drove about 2 miles since the change to conventional oil and I hope it goes away. I am pretty sure it wasn't there before messing with the rear diff oil. There wasn't any concerning new metal shavings or anything after the change so I don't suspect any worrying damage was done. Will also update if that popping noise goes away now that it's swapped out.
     
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  8. Sep 20, 2022 at 2:06 PM
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    milescf

    milescf Well-Known Member

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  9. Sep 20, 2022 at 2:08 PM
    #9
    brian92s

    brian92s [OP] Well-Known Member

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    @milescf maybe even go as far as to use conventional instead of synthetic, I had 0 noise/issues after putting conventional + friction modifier, good luck!
     
  10. Sep 20, 2022 at 2:24 PM
    #10
    milescf

    milescf Well-Known Member

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    Yeah, I’m standing in autozone now wondering if I just need to drain that 3 qts of synthetic on the ground and start over. Pissed! (Wouldn’t drain on ground, obviously)
     
  11. Sep 20, 2022 at 2:25 PM
    #11
    brian92s

    brian92s [OP] Well-Known Member

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    @milescf I guess personally I'd buy 2 bottles of friction modifier, then the conventional, and try just adding the friction modifier and returning the other 2 if that works, or else having it all on hand just in case it doesn't fully resolve your issues!
     
  12. Sep 20, 2022 at 3:14 PM
    #12
    milescf

    milescf Well-Known Member

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    I drained enough gear oil to add the modifier, and I the groaning and bitching immediately went away, so I’m running the full synthetic which already has the additive + 7 oz (one full tube) of the modifier. I guess if it grenades I’ve got the green light to order the harrop e-locker that’s been for sale in marketplace.
    :facepalm:
    I’ll post again after road trip this weekend to let you know how it went.
     
  13. Nov 9, 2022 at 6:28 AM
    #13
    rcoleyau

    rcoleyau Member

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    Hey guys, big thanks for posting all this. Just did a diff change on my 08 and had similar experiences. Probably should've researched and scanned through before doing it. Anyway, had the nasty sound after using Valvoline syn, redid following above....now grinding and slipping!
     
  14. Nov 9, 2022 at 11:51 AM
    #14
    TheDevilYouLove

    TheDevilYouLove You can’t polish a turd, but you can polish a TRD

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  15. Nov 9, 2022 at 12:05 PM
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    will.i.was

    will.i.was Well-Known Member

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    I always use the cheap gigantic 5 quart bottle available at auto parts stores and never had an issue. Didn't see much of a point in putting full synthetic in the rear diff tbh
     
  16. Nov 10, 2022 at 4:58 AM
    #16
    ARB1977

    ARB1977 It’s a beaut Clark

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    Amsoil Severe Gear 75W90 in my Prerunners diff. No noises.
     

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