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GOV-LOC ADDITIVE?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by pr1aw, Oct 6, 2001.

  1. pr1aw

    pr1aw 1/2 ton status

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    LOOKED AT THE SEARCH AND THERE ARE 2 THOUGHTS ON WHAT TO USE OR NOT TO USE FOR AN ADDITIVE. WHATS THE STRAIGHT SKINNY. I'M GOING TO CHANGE THE FLUID IN MY DIFFS TODAY. 10 BOLTS.
     
  2. mike reeh

    mike reeh 1/2 ton status

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    if it has a clutch type posi (I thought gov-loc was in the 14 bolts? definately not sure) then goto kragens and pick up a tube of that GL-5 limited slip additive, its made by CRC and is right next to the engine assembly lube.. its in a blue tube sorta like toothpaste and silicone gasket maker... thats what I use, good stuff..

    there are many kragens in my area, some carry it some dont.. they all seem to have a very differing stock.. but pepboys has it too
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    If you have a G80 limited slip diff it is recommended that you use it when you change out the fluid.



    <font color=blue> WE WILL NEVER SURRENDER<font color=blue>
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    No you do not use posi additive with a gov-lock. Straight out of the 1982 GM C/K service manual. G80 is a generic code, you could have any number of differentials(posi or gov-lock, 4 or 5 types according to the axle you have)

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  5. Thunder

    Thunder 3/4 ton status

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    Yup. The gov- lock that is in your 10 bolt requires no additive. 80-90wt GL-5 gear oil is all you need. That is straight out of my GM shop manual also.

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  6. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    So how the heck does a guy tell what style of limited slip he has in his diff? I just read your post about different syles of locking differentials and I'm more confused than ever[​IMG]......

    BTW, my mechanic at work told me that my 84 required the additive. He's had three or four different Chev 4x4s and said that his needed the additive, too.



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  7. RedDwarf

    RedDwarf 1/2 ton status

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    If you have a GM truck with a factory limited slip since '73 then you have a Gov Loc.(actually, there was one year when NoSpin was optional, 74 I think)

    To be sure, you have to open it up and take a look. Even if the tag says G80, somebody could have swapped it out.

    Still Poundin' "pavment" after all these years!!! [​IMG]
     
  8. Thunder

    Thunder 3/4 ton status

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    Well if you are really worried about the Limited slip additive issue. Or you dont know what you have in your axle. Just use Pennzoil gearplus 80-90 GL-5 gear lube it has all the limited slip additives in it. It is a good heavy duty gearlube and can be used in any diff that has a GL-5 requirement . Penzoil does not recomend the use of any other limited slip additives when using it as a lube.
    I use Penzoil Gearplus in my diffs. And an very satisifed with its performance.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze>http://coloradok5.com/gallery/Thunders-Blaze</a>
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  9. chevrules

    chevrules 1/2 ton status

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    The first year of the Gov-Lock was 1977,before that they used an Eaton Trac-Loc.This only had clutches and not all the little ratchet crap.The Gov-Lock was used in the 10B,12B and 14B FF.They did not require an additive.

    chevrules...always has and always will
     
  10. pr1aw

    pr1aw 1/2 ton status

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    WELL, I PUT THE KRAGEN ADDITIVE IN IT, IF IT BLOWS COOL, I CAN PUT IN A 14 BOLT, IF NOT???? I'LL POST ON FURTHER RESULTS. GLAD I CHANGED IT, WATER INTRUSION, HAD TO CHANGE OUT THE PINION SEAL.
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    If you have a 10 bolt, stock with G80, I'd say its gov-lock. I have yet to hear or see of any truck that had G80 with 10bolts, that had anything other than the gov-lock.

    The guy can say use LS diff fluid, but there is no higher authority than the GM service manual. And since the gov-lock is NOT like G80 (limited slip) in the cars, it makes sense that GM says this. Heck you could email Eaton as well if you wanted to.


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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