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what gear oil is everyone running?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by therover87, Jan 2, 2002.

  1. therover87

    therover87 1/2 ton status

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    i am going to be replacing my rear differential gasket tomorrow and i was wondering what gear oil everyone is running, are some companies better than others, thanks.
     
  2. Sparky87k5

    Sparky87k5 1/2 ton status

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    I run NAPA 75/90W synthetic in trans and both axles. Haven't had a problem either.

    87 K5, 427BBC,D60 & 14BFF, NV4500, NP208, TSM disc's,
     
  3. m j

    m j 1/2 ton status

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    penzoil4096

    formerly 77chev
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Mobil 1 here.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  5. The_Sandman_454

    The_Sandman_454 1/2 ton status

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    Another vote for Mobil 1 full synthetic gear lube here...

    Tim
    &lt;img src="http://bbs.off-road.com/wwwthreads_uploads/53-559733-usflaglargesm.jpg"&gt;
    <font color=red>"Don't Tread on Me"</font color=red>
     
  6. DesertDueler

    DesertDueler 1/2 ton status

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    Redline shock proof gear oil. Thats stuff works so good that it sticks to things that havent moved in a couple days. Definatly worth the money.

    86Jimmy 4"&35"MTRs,87 burb 4"&33"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. Twiz

    Twiz 1/2 ton status

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    Grape sented synthetic.

    G.M. P/N 12378261

    <font color=blue>Wow Factor
    A SBC at 6000 RPM, Piston speed of 60 MPH.
    3- The intake charge reaches a speed 4 X greater than the piston.
    Thats 240 MPH.
     
  8. solowookie

    solowookie 1/2 ton status

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    ok let me be the moron and ask what in the world grape sented synthetic is??? [​IMG][​IMG]

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  9. therover87

    therover87 1/2 ton status

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    does it have to be synthetic?
     
  10. 90K5

    90K5 1/2 ton status

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    I run Valvoline Dura Blend in mine, 80w-90
    it doesn't have to be synthetic, but you don't have to worry about it as often as you would if you ran conventional stuff. Plus, it keeps it cooler, so the diffs last longer.

    90K5
     
  11. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    It doesn't have to be synthetic but synthetic lasts longer and generally has superior qualities to dino juice. I think you generally should change to it after a rebuild (or very thorough cleaning) so that it is not contaminated by the old stuff.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  12. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Jeff, you must have missed this one.
    <a target="_blank" href=http://coloradok5.com/forums/showflat.php?Cat=&amp;Board=blazer4x4&amp;Number=299812&amp;page=&amp;view=&amp;sb=&amp;o=&amp;vc=1>http://coloradok5.com/forums/showflat.php?Cat=&amp;Board=blazer4x4&amp;Number=299812&amp;page=&amp;view=&amp;sb=&amp;o=&amp;vc=1</a>

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  13. blk87K5

    blk87K5 1/2 ton status

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    I believe that synthetic breaks down slower and is easier on moving parts due to the smooth structure of the man-made molecules, compared to the rough texture of fossil based lubes. I run Amsoil synthetic gear lube. My $.02.

    '87 K-5 w/ 350 TBI, 700r-4, Atlas II, D60 & 14Bolt, 6" susp., 1" ORD body, 35" Claws
     
  14. The_Sandman_454

    The_Sandman_454 1/2 ton status

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    I prefer synthetic because it'll actually flow in cold temperatures, better than dinosaur juice anyhow...

    Tim
     
  15. 3car

    3car 1/2 ton status

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    redline

    eatin'fords and shittin'dodges down in the sunshine state.
     
  16. Triaged

    Triaged 1/2 ton status

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    I run the syn. stuff in my s-10 but in the blazer I run the cheep stuff that I get by the gallon in 80w120 (the thick stuff). It costs too much to run syn. when I have to change it out all the time because I get water in it.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  17. sinchphoto

    sinchphoto 1/2 ton status

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    my buddy that does rear and front ends uses Torco oil I forget the grade.
     
  18. ABO

    ABO Registered Member

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  19. Twiz

    Twiz 1/2 ton status

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    Thanks for the link Bad Dawg. Saved me the trouble. (I'm still giggiling over it!)

    80/90, stanfdred gear oil.
    That stuff has been used since for-ever! It works, and works well. There is really no reason to step-up to a Synth-blend ($$) unless the rear gears are under-extream stress or your looking for maximum MPG.

    75/90 Full Synthetic.
    It is installed from the factory on the new G.M. trucks ('00ish and up) It has superior lubrication and thermal stability. I would assume, because of the better lubrication, it would reduse friction, and increase MPG, and thats why the Genneral has desided to use it (even considering the extra-cost). The factories are always under constant pressure, from the government and consumer, for better MPG. So, If G.M. installs it (and I can assume why) than it probably works.

    I'd fill it with 80/90 if it's under "normal" use. The gears look good, your not towing with a 10-bolt, your not tring to expiremint with your MPG rating, Ect... or if you dunk your rear axle under-water, like when unloading a boat, because, you should assume, the rear axle will take in water and will need to be changed sooner. So, in the long run, it will save some money in the long run.

    Use 75/90 Full-Synth in the rear, if you plan on towing, or the gears are "ruff" (It's worth a shot, or atleast dealy the R/P swap) Or you expect to use it under "heavy-use". It will -probably- will hold up better if contaminated with water, but the money involved to change it-out doesn't "pan-out".
    -IMO-




    <font color=blue>Wow Factor
    A SBC at 6000 RPM, Piston speed of 60 MPH.
    3- The intake charge reaches a speed 4 X greater than the piston.
    Thats 240 MPH.
     
  20. solowookie

    solowookie 1/2 ton status

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    oh BadDog, how in the world did I miss that post??? ROTFLOL!!! [​IMG][​IMG][​IMG][​IMG][​IMG]

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     

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