Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Gov lock???

Discussion in 'The Garage' started by stallion85, Jun 4, 2004.

  1. stallion85

    stallion85 1/2 ton status

    Joined:
    Jul 11, 2003
    Posts:
    3,659
    Likes Received:
    0
    Location:
    Cedar City, UT
    Do gov locks recquire any maintanance? ie; special lube added to diff fluid or clutch pack rebuild kits? I am not quite sure how they work? It is basically a posi trac right? Any input is encouraged, besides you know your gov lock is a piece of !!!! right? You need a locker, dude. I know, I know. For right now the locker is going in the front if there is one going in. /forums/images/graemlins/thumb.gif
     
  2. Fry

    Fry 1/2 ton status

    Joined:
    Sep 5, 2002
    Posts:
    400
    Likes Received:
    0
    Location:
    Sask, Canada
    GM told me that unless your getting chatter on the streets then don't need to add lube.
    They have clutches in them that wear.
    You can buy rebuild kits for them through eaton that I read before for the 14 bolt.
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    i haven't put and "special lube" in mine. it has some type of clutch packs in it but i dont know what for, it might be the actual locking part of it. i know some who have put the LSD additive in theirs and it doesn't locks.

    BTW i like mine, but am waiting for it to blow so i have an excuse to put a 14bff with detroit in it /forums/images/graemlins/waytogo.gif
     
  4. 4xcrazy

    4xcrazy 3/4 ton status

    Joined:
    Oct 31, 2003
    Posts:
    9,471
    Likes Received:
    5
    Location:
    Olympia/Lacey, Washington
    I read somewhere, that the "special lube" is actually for making the clutches slip more than grab too much, something along the lines of if they grab too much, they wear out faster.

    But also with the Gov-Locs, your not supposed to use the additive in them, only the limited slip spring and clutch diffs.
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    [ QUOTE ]
    BTW i like mine, but am waiting for it to blow so i have an excuse to put a 14bff with detroit in it /forums/images/graemlins/waytogo.gif

    [/ QUOTE ]

    Good luck, i beat the snot out of my 14 bolt SF for two years and never managed to break it. Even had the 38.5s on it for a while.
     
  6. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    good, gives me time to locate the parts and money and get it all together /forums/images/graemlins/waytogo.gif
     
  7. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    Just to see what makes 'em work, I just disassembled the old Gov-Loc from my S-Jimmy. It's actually a pretty slick contraption! A fine-toothed gear on one end of the diff will start a small, weighted governor spinning if the 2 axles start to rotate at different speeds. The governor is spring loaded, so that it won't engage the posi until the speed difference between the 2 axles is approximately 100 RPM (so you don't fight the posi in normal cornering). Once that RPM is reached, a pair of cogs swings outward and engage against another governor-type device (one of the cogs works for forward motion, the other for reverse). This stops the first governor from spinning, which stops the fine-toothed gear on the end of the shaft from spinning. The fine-toothed gear has a wave-shaped back, which normally fits into another wave shaped section on the side gear. When the governor forces the fine-toothed gear to stop rotating, the two wave-shaped sections of the gears start sliding against each other, which forces the side gear to move towards the center of the diff. As it moves, it applies force to the clutch packs, connecting the two side gears together via friction.

    Now, remember the 2nd governor-type device? It is also spring loaded, and once the wheels are spinning at about 30 MPH, it swings out of the way and disables the ability of the first governor to lock against it.

    So in normal driving, there is nearly zero preload on the clutch packs (there's a small wave washer that applies just enough pressure to keep the clutches from rattling around when the posi isn't engaged), which means your diff behaves as if it were open.

    When a wheel starts slipping (below 30 MPH)the posi engages quickly and firmly, providing drive to both wheels.

    Over 30 MPH, the posi can't engage, so it won't create any driving quirks at speed.

    It's a pretty damn nifty piece of engineering! /forums/images/graemlins/thumb.gif But the trick to making one live is to be easy on the throttle. Doing stuff like full-throttle bursts from a standstill in the mud, or on ice/snow, will cause a tremendous shock load as the clutches are slammed home and everything locks together. That's when gov-loc-go-boom! /forums/images/graemlins/wink.gif

    All of the other clutch type posis that I can think of work very differently. They typically have a couple of mongo springs inside, that pre-load the clutches against the side gears. This means that the clutch packs are always trying to keep the axles from rotating at different speeds. As you go around a corner, the traction of the tires must overcome the friction of the clutch packs before the diff will actually allow differentiation. This is the type of posi that will be most likely to chatter. Posi additives modify the friction coefficient of the clutches so that they can operate more smoothly when cornering. Since the gov-loc doesn't engage the clutches until they're needed, it doesn't need the additive. /forums/images/graemlins/thumb.gif
     
  8. ugly_blazer

    ugly_blazer 1/2 ton status

    Joined:
    Apr 12, 2004
    Posts:
    1,214
    Likes Received:
    0
    That's cool how it works only under 30 mph, but I wish it didn't take the 100 rpm difference to make it work. Do the gov-locks in a 14 FF work the same way? They look a lot different than the ones in a 12 bolt.

    From what I have read the gov'lock does not need any additive, BUT:

    My 14 bolt FF has a gov-lock and I changed the oil in it and then it wouldn't lock in, it just made a horrible grinding noise. I asked both of the local 4x4 shops around here if I had to use any additive, they both said yes. They sold me 2 tubes of Dana "friction modifier" and it works great after adding them. I know of a couple other people that had the same thing.
     
  9. gravdigr

    gravdigr 1/2 ton status

    Joined:
    Apr 15, 2003
    Posts:
    1,129
    Likes Received:
    0
    Location:
    Tyrone, PA
    taken directly from HERE

    [ QUOTE ]
    Availability

    ¨ Standard Equipment on Dual Wheel 3500 Series trucks.

    ¨ Optional Equipment (G80 Order Code) on all GM two-wheel and four-wheel drive light trucks and sport utilities.
    Benefits

    ¨ Improved traction differentiates the vehicle relative to other rear wheel and four-wheel drive vehicles on the market.

    ¨ Functions as a limited slip differential during normal driving conditions; provides full axle lock when needed.

    ¨ Maintenance free; requires no lube additives.

    ¨ Enhanced towing and off-road performance.

    ¨ Patented carbon friction disc technology enhances performance and durability while reducing warranty claims.
    Principles of Operation

    ¨ Wheel speed difference (left to right) in excess of 100 RPM will cause a flyweight mechanism to open and catch a latching bracket.

    ¨ The stopped flyweight will trigger a self-energizing clutch system, which results in the cam plate ramping against a side gear.

    ¨ Ramping increases until both axles turn at the same speed (full lock), which prevents further wheel slip.

    ¨ At speeds above 20MPH, the latching bracket swings away from the governor and prevents lockup from occurring.
    Technical Specifications

    ¨ Automatic locking takes place within a fraction of a second, so smoothly that it is unnoticed by the average driver.

    ¨ Unlocking occurs automatically, once the need for improved traction is gone, and is unnoticeable to the average driver.

    ¨ Compatible with anti-lock brake systems.

    [/ QUOTE ]
     
  10. stallion85

    stallion85 1/2 ton status

    Joined:
    Jul 11, 2003
    Posts:
    3,659
    Likes Received:
    0
    Location:
    Cedar City, UT
    Wow, thanks guys, lots of cool info! I will just leave it as is just to be safe. I have had no problems so far /forums/images/graemlins/thumb.gif Just curious??
     
  11. BlazerWheels

    BlazerWheels 1/2 ton status

    Joined:
    Feb 13, 2003
    Posts:
    587
    Likes Received:
    0
    Location:
    California
    Anyone got a picture of a gove lock??? I got an extra 10 bolt and am not sure what is in it... /forums/images/graemlins/confused.gif
     
  12. big jimmy 91

    big jimmy 91 1/2 ton status

    Joined:
    Feb 21, 2004
    Posts:
    639
    Likes Received:
    0
    Location:
    Northwestern Ontario Canada
    look in web shots "whats this" and you will see a few crappy pics of mine
    /forums/images/graemlins/thumb.gif
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,975
    Likes Received:
    189
    Location:
    Roy WA
  14. BlazerWheels

    BlazerWheels 1/2 ton status

    Joined:
    Feb 13, 2003
    Posts:
    587
    Likes Received:
    0
    Location:
    California
    clicky no worky /forums/images/graemlins/doah.gif
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,975
    Likes Received:
    189
    Location:
    Roy WA
    Works for me, I just re-did the link. If it doesn't work, just go to differential pics
     
  16. stallion85

    stallion85 1/2 ton status

    Joined:
    Jul 11, 2003
    Posts:
    3,659
    Likes Received:
    0
    Location:
    Cedar City, UT
  17. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    That's a great pic of a 14-bolt Gov-Loc, but the 10-bolt version looks nothing like that. /forums/images/graemlins/blush.gif

    There was a link above that takes you to the Eaton website, and a picture of a 10-bolt version. /forums/images/graemlins/thumb.gif
     

Share This Page