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I have a hot REAR END!

Discussion in '2nd Gen. Tacomas (2005-2015)' started by pwo, Apr 12, 2012.

  1. Apr 12, 2012 at 7:13 PM
    #1
    pwo

    pwo [OP] Active Member

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    No, you cannot have pics. of my ass!!!! No homo here...

    Just saying my rear differential is pretty hot after short interstate runs at around 70mph. Is this normal for Tacoma's? You can't leave your hand on it.

    Four days ago after I got to work I noticed that I had oil pooling on the inside of my drivers side rim. I then immediately checked the differential oil level and it was about a 1/2 qt. low, so I topped it off and headed back home (1 hour away). The next day I pulled the axle shaft and replaced the inner seal, drain and change on the diff., and new rear shoes.

    But, the diff. is still getting pretty hot. This is my first taco but it doesn't give me a warm and fuzzy about it, maybe its normal for these trucks. I have only had this thing for a little over a month and never felt the temp of it before the seal blew.

    I did search not much comes up for the rear differential. Any help and reassurance will be appreciated, Thanks....
     
  2. Apr 12, 2012 at 7:45 PM
    #2
    2004TacomaSR5

    2004TacomaSR5 Sentinel Prime

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    Never felt my diff, not sure. I am sure they are supposed to get warm though, lots of stuff moving around in there, is it like scalding hot or what?
     
  3. Apr 12, 2012 at 7:47 PM
    #3
    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

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    Check your rear diff breather..if its clogged it will be abnormally hot, and also causes pressure which can blow axle seals
     
  4. Apr 12, 2012 at 7:51 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    They can get pretty hot, depending on how fast you drive. They can normally get up to 150* under normal conditions.
     
  5. Apr 12, 2012 at 8:10 PM
    #5
    pwo

    pwo [OP] Active Member

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    Thought that might be it to, so I just did the breather mod today just have not driven it yet to see if it's any better.
     
  6. Apr 12, 2012 at 8:18 PM
    #6
    pwo

    pwo [OP] Active Member

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    I did not shoot it with an ir thermo as I don't have one at home. I know that around 125 you should be able to leave your hand on it with only slight stinging but very bearable. It is definitely higher than that as it did cause me to jerk back and curse. Guessing its running 150+ under normal driving.

    I have had two Jeeps and they never got this hot.
     
  7. Apr 12, 2012 at 8:22 PM
    #7
    KenpachiZaraki

    KenpachiZaraki Its Wicked Flow BITCHES!!

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    Have you checked the diff fluid?? Might be dirty, or there could be metal shavings
     
  8. Apr 12, 2012 at 8:24 PM
    #8
    Kelson

    Kelson My Truck is Cuter than Yours

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    if you touch hot things, you'll burn your hand.

    bumbai you learn.
     
  9. Apr 12, 2012 at 8:27 PM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Youre also running an LS Diff, so it can get hotter than an open diff. As long as it stays below 200*, youre fine.
     
  10. Apr 12, 2012 at 9:11 PM
    #10
    badger

    badger Well-Known Member

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    The diff in the 4.0 Tacoma is too small for the application. It's only an 8" ring, and there is too much HP for that small of a gear. The result is high temps. On the freeway they will run 170 to 190 depending on the ambient temp. A normal freeway diff temp for a properly sized ring is around 150. If you pull a trailer, especially up grades, you can hit temps of 220 or higher. Most gear oils can take temps up to 220 without significant damage. At around 240 most synthetics start giving up. A very few, like Redline can take temps much higher, but anything over 220 is the red zone because seals don't like excessive heat either.
    If you tow, or do alot of high speed driving, or climb alot of grades, you should use a top grade synthetic and change it every year. I run Redline 75-140.

    Also, if you use a infrared thermometer to check the diff temp, you need to stop quickly and read the temp immediately. The temp will drop very quickly once the load is relieved.
     
  11. Apr 12, 2012 at 9:12 PM
    #11
    Tacon

    Tacon Member

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    I've messed w/ Dana and Ford differentials.
    Here's some temps I got.
    70 mph cruise (fresh build w/ new bearings) runs up to about 165F.
    70 mph cruise (fresh build w/ old bearings) runs about 135F.
    70mph cruise on broken in diff runs about 125F to 135F.
    I agree w/ chris; If you are pushing 200F it's time to sweat.
    I agree w/ hedles; check fluid for significant metal shavings, nasty opacity and burnt smell.
     
  12. Apr 12, 2012 at 10:04 PM
    #12
    pwo

    pwo [OP] Active Member

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    Thanks for the info. It did have some nasty stuff in there when I changed it. The oil was pretty much black, and the magnetic drain plug had some thick greasy sludge covering it. Also some larger than normal shavings (2-3) but really thin I thought that the shavings might have been what was left of the old seal spring. As the rubber on the seal I took out was almost gone with no spring. Hope it's not wrecked, it looked like the oil has never been changed. Bad thing is I got dealer service records documenting service on this truck since it was new, thought it would be good to go...
     
  13. Apr 12, 2012 at 10:23 PM
    #13
    pwo

    pwo [OP] Active Member

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    Used Lucas 75-90, it says no additives needed that it is perfect for LSD.
    This stuff:
    [​IMG]

    [​IMG]

    First time using their products in a 4wheeler, been using their stuff in my bikes for awhile now.
     
  14. Apr 12, 2012 at 10:38 PM
    #14
    landphil

    landphil Wishin' I was Fishin'

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    Lucas products usually raise operating temps in diffs or trannies significantly, despite what the propaganda on the bottle says. I speak from personal experience on this, and will never recommend lucas. I'd drain it and put real lubricant in, with LSD additive.
     
  15. Apr 12, 2012 at 11:56 PM
    #15
    Tacon

    Tacon Member

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    If 2-3 larger shavings were found you can be sure more are there.
    How big are the shavings?
    Significant shavings can wreck the bearings then wreck the entire differential.
    I would disassemble entire differential then clean and inspect.

    If the differential is currently whine-free there is a good chance it will live following a good cleaning. There is also a chance the bearings can chew up the shavings and survive w/o cleaning.

    Million dollar question is if the shavings are significant enough to trash the differential.

    As a minimum I would flood the differential with kerosene. Gently drive on level driveway a few yards. Drain kerosene. Add cheap gear oil. Drive a few easy miles. Drain. Add final gear oil mix. Monitor temp and noise now and then.
     
  16. Apr 13, 2012 at 6:39 AM
    #16
    pwo

    pwo [OP] Active Member

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    Yeah, I will definitely do a flush and drain then, it sucks dumping $50 worth of oil though. Oh well I got to make it right. Think I will just put regular old diff oil w/ additive in there next.
     
  17. Apr 13, 2012 at 6:51 AM
    #17
    ecoterragaia

    ecoterragaia Well-Known Member

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    I changed my diff lube when i bought the truck at 18000 miles, it was black and sludgy with a couple of shavings too. There was even a hunk of metal leftover from the milling process. Changed it again a year later and the fluid looked exactly like it did when i put it in the first time.
     
  18. Apr 13, 2012 at 7:02 AM
    #18
    pwo

    pwo [OP] Active Member

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    The differential has zero noise coming from it at this time. If it does go, a locker is coming sooner than later!!!!!!! Woo-Hoo!!!!!
     
  19. Apr 13, 2012 at 7:21 AM
    #19
    landphil

    landphil Wishin' I was Fishin'

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    I'm a commercial truck tech with my specialty being gears, so I know my "stuff".
    Who do you mean by ESGS? :confused:Google came up with "European Squad of Gifted Soldiers" and "European Salivary Gland Society". I wouldn't take either's opinion on this matter.:rolleyes:
     
  20. Apr 13, 2012 at 7:48 AM
    #20
    badger

    badger Well-Known Member

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    Lucas is not my first pick either for transmission or diffferential. I run a temperature probe in my rear differential so I'm not guessing either. Keeping the heat build under control during towing has been a major concern of mine with this truck.
     
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