How to engage locker?

[mistaare]

If I understand correctly,  if the rear wheels are spinning the locker will self engage right? Do you have to be in 4wd lo for it to engage? 
 

I have had the rear wheels spinning twice now and neither time did it feel like the rear wheels were locked, once in 2wd once in 4wd high. Both times climbing a muddy hill crawling. 
 

[BrooklynBravest]

I’m no expert I don’t even have my truck yet, but for starters do you have the AT4? 
 

i believe the locking differential is only part of the AT4.

 

if you have it, then it engages on its own as you stated as a reaction to loss of traction. I know one complaint from off-road enthusiasts was it does not have a specific on off button like the ram Rebel and Jeeps do.

[HeySkippyDog]

Do you have the code G80 on your RPO sticker? If not, you don't have the locker.

It's controlled automatically. I've heard that a 120 RPM difference between the wheel speeds engages it.

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[mistaare]

I have not looked at the RPO sticker but I do have an AT4 so I would assume I have one. 
 

It will engage in 2hi, 4hi and/or 4lo? 
 

Maybe I need to let the wheels spin more for it to engage....

[CamGTP]

It doesn't matter what selection the transfer case is in.

 

[HeySkippyDog]

I have not looked at the RPO sticker but I do have an AT4 so I would assume I have one. 
 
It will engage in 2hi, 4hi and/or 4lo? 
 
Maybe I need to let the wheels spin more for it to engage....

My guess is that you do have it, but stranger things have happened.

I'd also like to point out that the G80 locking differential is not ONLY in the AT4/Trail Boss trucks.

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[econometrics]

26 minutes ago, mistaare said:

Maybe I need to let the wheels spin more for it to engage....

You have an AT4, so you have a G80 locker. It will lock up in 2H, 4H, etc. 
 

Yes, you just need to get the rear spinning a little more and you’ll feel (and even hear) it lock in. 

[econometrics]

Watch: 

 

 

[Z45]

¨ 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.

¨ 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.

[Z45]

 

[Thomcat]

It engages if one rear wheel is spinning (either off the ground or on ice) and the other wheel is not and all power is supplied to the spinning wheel....locker mechanically locks both wheels so power is applied to both wheels equally........above video is an excellent example of operation in both instances.

[HeySkippyDog]

They are definitely not maintenance free, however. You do need to change your differential fluid about once every 50,000 miles or earlier if you drive in deep water or routinely engage the locker.

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[mistaare]

Great feedback guys thanks. 
 

So if both wheels are spinning then the locker is engaged? The one time I definitely had both wheels spinning and just wasn’t going anywhere (until I put it in 4wd hi). 

[Colossus]

You also don't want to be spinning the wheel very quickly to where the diff slams in, that is what kills the G80. 

[mistaare]

31 minutes ago, Colossus said:

You also don't want to be spinning the wheel very quickly to where the diff slams in, that is what kills the G80. 

Ugh, so there is a fine line between to much spin and to little spin.