I'm almost positive my truck has front and rear lockers on it (had fun in some deep mud), but I hear all the guys on jeep boards and especially toyota boards saying how the h3 sucks because it doesn't have any lockers.
Sooo if thats the case what exactly is being "locked" when I push the "lock" button?

Matt

 

Normally you have 40% front and 60% rear. When you push the LOCK button you have 50%-50%. If you have lockers, there is an additional button (06-08) rear locker, (09-10) 2 buttons for front and rear lockers. It is an X looking button

 

Read this thread
https://www.hummerforums.com/forum/s...ad.php?t=17920

 

Ok I understand. Thanks guys.

 

Alright so I got to thinking.

If when I lock the truck in 4lock, why does the front end buckle and whatnot if there is no locker up there? If it were an open diff, there would be no binding etc..

 

Geometry.
When you turn a corner, the front two wheels travel a larger arc than the back two, thus they have to turn more revolutions than the rear, but the T case will not allow that in lock = bind. Bad doo doo on a hard surface, on a soft or slippery surface, the tires are allowed some loss of traction and much less bind.

 

What I dont get though, is since they aren't lockers up front why cant the front tires turn independantly of each other??

 

The 4-hi/low lock buttons mechanically lock only the center differential. The tires bind on pavement during turns because the lock keeps at least one front and one rear tire turning at the same speed when each tire wants to spin at a unique speed.

Don't forget that your truck also has traction control on all 4 wheels that provides up to full front and rear locking effect. It automaically applies the brakes to individual tires as needed to keep them all turning at the same speed.

If you feel a wheel start to spin, don't feather the gas like you would with a mechanical lock sytem. It takes the system a moment to fully engage. Keep your foot into it and even apply more power as needed to give the system torque at the wheels to work with. If you keep lifting off the gas when a wheel spins you are basically just shutting the traction system down the moment it should start to work!

 

Awesome thats some good info. So thats why these trucks are so good at rock crawling and climbing etc because of the center diff lock.

When I was in the mud a few weeks ago all 4 wheels were def spinning though in 4low