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best gear lube for rear diff

Discussion in '4 Cylinder' started by NACooner, Apr 2, 2013.

  1. Apr 2, 2013 at 7:55 PM
    #1
    NACooner

    NACooner [OP] Member

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    I have an 01 with a 2.7, It has just over 100k, I drive about 60 miles a day, just wondering what you all prefer to run! Thanks.

    Nac
     
  2. Apr 2, 2013 at 7:56 PM
    #2
    taco terror

    taco terror got 5VZFE?

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    I have never changed mine, but Lucas Oil is probably good stuff.
     
  3. Apr 2, 2013 at 7:56 PM
    #3
    MightyMouse-SCT

    MightyMouse-SCT Well-Known Member

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    I'd go synthetic . I use M1 .
     
  4. Apr 2, 2013 at 7:57 PM
    #4
    650H1

    650H1 Well-Known Member

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    x2, i just did mine with M1 75w-90. I wanted to use 75w-140, but didnt want to spend 20 bucks a quart.
     
  5. Apr 3, 2013 at 1:20 PM
    #5
    Silver Streak

    Silver Streak Well-Known Member

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    I think lucas is some of the best. i just used conventional not synthetic. not something your really going to tell a diffrence with. Especially since your supposed to change out every 30k miles. Not really worth the extra money for synthetic imo
     
  6. Apr 3, 2013 at 2:26 PM
    #6
    650H1

    650H1 Well-Known Member

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    30k is a lot of miles, and a long ass time for some people. For me, it's about a year. I trust that synthetic will not break down like conventional will over that amount of time and miles.
     
  7. Apr 3, 2013 at 2:28 PM
    #7
    Manwithoutaplan

    Manwithoutaplan the full Monty

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    synthetic you don't even get your diff hot enough to ulitilze the oil. Seems like a waste of money. I just used dino oil for my arb's.
     
  8. Apr 3, 2013 at 2:39 PM
    #8
    oldblue1968chevy

    oldblue1968chevy Well-Known Member

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    synthetic vavoline is what im runnin
     
  9. Apr 3, 2013 at 7:42 PM
    #9
    Rackster

    Rackster Well-Known Member

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    I'm wondering though...I notice my roll distance and speed are affected on the cold morning start ups. With synthetics, resistance might be less on cold mornings. Just thinking out loud...
     
  10. Apr 3, 2013 at 7:58 PM
    #10
    taco terror

    taco terror got 5VZFE?

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    I am going to go ahead and guess that, that is because the grease in your wheel bearings is cold. It is actually a combination of all lubricants being cold and more viscous than at operating temps.

    Full synthetic will more than likely not make a noticeable difference at all.
     
  11. Apr 3, 2013 at 8:12 PM
    #11
    gearcruncher

    gearcruncher Well-Known Member

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  12. Apr 4, 2013 at 7:35 AM
    #12
    iroh

    iroh Well-Known Member

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    For the first five miles the difference is huge when its below freezing. Dino oil is like tar at 10 degrees; synthetic will at least flow somewhat. If you want to see for yourself, try running dino lube through a hand pump when it's that cold. Darn near impossible. The synthetic will give you cramps but at least it will go through the hose.

    In the summertime it won't be a big deal of difference but with it I still saw a small improvement in the overall mileage trend.

    Personally I use Redline GL5, mostly because I'm already buying a bunch of MT-90 for the tranny and transfer case and I like to do them all at the same time.
     
  13. Apr 4, 2013 at 7:37 AM
    #13
    Large

    Large Red

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    Some trucks go their lifetime without getting their diff fluids changed, I wouldn't personally do it to a $30k truck..
     
  14. Apr 4, 2013 at 8:42 AM
    #14
    Snorkie

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    Mines been about 100k since I've changed it. A lot also depends on if you drive through water, mud, or sand.
     
  15. Apr 4, 2013 at 8:51 AM
    #15
    Large

    Large Red

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    Oh and you don't do any of that do you? ;)
     
  16. Apr 4, 2013 at 8:59 AM
    #16
    fireturk41

    fireturk41 I like to break shit!

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    as an amsoil dealer i reccomend lucas i think 90-140 was the weight,


    then again if you wanna spend some money you can always buy amsoil
     
  17. Apr 4, 2013 at 9:28 AM
    #17
    Fifthwind

    Fifthwind Master of None

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    I use Red Line 57904 (75W90) Synthetic Gear Oil, since it has the best temperature rating. Up and down some steep hills with a half ton of mulch or stone and that diff gets H-O-T!
     
  18. Apr 4, 2013 at 12:10 PM
    #18
    Snorkie

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    Try not to.
     
  19. Apr 4, 2013 at 3:09 PM
    #19
    Rackster

    Rackster Well-Known Member

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    MIgander, TT,

    Thanks for the responses. I suspect that moving to full synthetics (grease and oil) would help improve the cold morning starts and improve vehicle performance (MPGs). I'm at the point that I will need to do the lubing - already squeezed in synthetics into the Universals and driveshaft. Getting warmer now, so the real difference wont be known until next fall/winter...which is fine by me.
     
  20. Apr 17, 2013 at 5:54 AM
    #20
    PSJ

    PSJ Prerunners Work

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    At 30K, I went full syn. with all my oils. Rear diff was filled with Amsoil 75-90 Severe Gear Oil. Factory oil still looked great, like new. Manual tranny oil showed more wear in the color, but was only a medium tan and still good. Just as an FYI...:cool:
     
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