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More on Limited Slips and the G80

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by crahm, Aug 30, 2001.

  1. crahm

    crahm Registered Member

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    Yesterday was a lenghty discussion on gear ratios and how to determine what you have. My glove box on my newly purchased 87 has the GU6 and G80 indicating 3.42 rear end and limited slip diffs respectively. Now, I plan to pull the covers and inspect. My questions are: Does the G80 package put limited slip in the front diff as well? How do you visually inspect a limited slip (can you visually inspect the clutches or measure them)? I plan to put 32" or 33" BFG MTs on this non lifted truck truck, will I be unhappy with the 3.42 ratio? This K5 is used on the highway, then in the mud. Thanks.
     
  2. RedDwarf

    RedDwarf 1/2 ton status

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    I have seen front and rear Gov Locs, but most only have rear.
    Only truck I have seen F/R on was 3/4 w/4spd.

    Lift It, Lock It, LIVE IT!!!
     
  3. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    As far as being happy, it is all a matter of personal preference (to some degree). You wouldn't want 2.73 gearing with those tires. If you don't have an OD tranny, that combo isn't the end of the world, especially if you do highway travel. If you have an OD tranny you might want to consider stepping up to 3.73 or 4.10 ratio for a little more take-off power but a few more rpm's at highway speeds. If you were only to off-road the machine, I would say you would definitely want to step up a few gears nomatter what kind of tranny, but since you do highway and mud (not slow rock-crawling), you could leave those gears alone (then again it is all personal preference).

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot>http://coloradok5.com/gallery/Leadfoot</a>
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I personally have not ever seen a front Gov-Lock. I'd go so far as to put money on GM never even offering it as an option...

    I think the 3.42's are borderline for 31's if you have the 700R-4.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Visually inspect the Gov-Lock by taking cover off and looking for chunks of metal at the bottom of the housing.

    Also, once you get it apart, you will see all kinds of small springs, weights, and gears, that look like clock innards. Inspect the small gear teeth (inner part of the carrier, drivers side) for broken teeth, and see that the weights on the carrier aren't stuck open or closed.

    This works on S-10's, but not sure how it works on our trucks with the bigger rear ends/bigger tires. Jack up the rear end (off the ground) put the vehicle in neutral, e-brake off. Spin one tire slowly, and watch the other one. If the gov-lock is operating correctly, (or maybe even broken) the opposite tire should be spinning in the OPPOSITE direction you are turning.

    Now, if that checks out ok, try spinning the same tire by hand, HARD. Try to turn it as fast as you can, from the get go. The mass you are trying to turn might be too heavy, but on the S-10's, you can move the tire fast enough to actually get the rear end to lock up. You'll hear and feel the "clunk" typically as the other axle takes up the movement you are imparting.

    Be aware, that at least in a 10 bolt, the Gov Lock carrier WILL explode if you like to spin large tires. If you know the limitations, and SLOWLY increase RPM's in tire spinning situations, you will lessen the likelihood of breakge. I've had two of them, and didn't break either, and I'm still running one of them.

    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
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    No civilian Chevy truck has ever come with a traction device of any kind in the front axle.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  7. RedDwarf

    RedDwarf 1/2 ton status

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    Maybe the truck that had it had got it swapped in, but there was a Gov-Loc in front.

    Like I said though, this is the only one I have ever seen where I knew this was the case.

    Lift It, Lock It, LIVE IT!!!
     
  8. xnoahx

    xnoahx 1/2 ton status

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    My uncle had a 71 k5 that he claims was one of 7 produced that came with a front limited slip or maybe it was just a full locked diff. i cant rember.

    Check out my 73 K5 <a target="_blank" href=http://members.theglobe.com/xnoahx/73k5.htm>http://members.theglobe.com/xnoahx/73k5.htm</a>
     

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