G80 Engaged Fulltime In 4lo?

alitterit · August 8, 2011

While in 4lo, if I make a turn the G80 acts as if its a spool... I don't understand why its working like that, anyone have any ideas or explanations??

hockeypro1411 · August 8, 2011

It's probably the front binding, not the rear. Turning in 4lo should be kept to a minimum anyway. The G80 is in no way, shape, or form related to the 4wd system at all. Odd coincidence at best.

alitterit · August 9, 2011

I am 100% positive its the rear tires not the front. (hung my head out the window and watched) I do know that the G80 isn't tied into the 4WD system at all like you said esp. being as its mechanical and uses centrifugal force to lock... This is why it has me so baffled as to why it would react like this...

On another note, I repeated the same "test" in 4hi and 2wd and nothing happened. The rear acted as it should and let the outside tire spin faster then the inside.

fraiolib · August 9, 2011

im not sure what your mean by on a spool.... but every truck ive ever drove in 4hi and or 4lo stuff seems to grab while turning,

Matt_ · August 9, 2011

The gear reduction in 4low exemplifies the binding. It's not the G80. Don't turn sharp in 4low (or 4x4 unless you have to for that matter).

This has nothing to do with the G80. It has to do with the length of the rear driveshaft and that the rear axle is the easier place for the binding to release itself due to the suspension setup and reduced weight on the rear tires. That's why you *think* its only coming from the the rear.

Want to prove it to yourself? Take take the front driveshaft off and retest.

txab · August 9, 2011

The gear reduction in 4low exemplifies the binding. It's not the G80. Don't turn sharp in 4low (or 4x4 unless you have to for that matter).

This has nothing to do with the G80. It has to do with the length of the rear driveshaft and that the rear axle is the easier place for the binding to release itself due to the suspension setup and reduced weight on the rear tires. That's why you *think* its only coming from the the rear.

Want to prove it to yourself? Take take the front driveshaft off and retest.

+1

fraiolib · August 9, 2011

This has always confused me, if both differentials are open, what is binding?

kdixer · August 9, 2011

This has always confused me, if both differentials are open, what is binding?

Both diffs are open allowing each diff to differentiate from side to side. One wheel is allowed to turn faster than the other on the same diff. But the problem is the front tires have to travel more distance than the rear tires in a turn, so even though the tries are allowed to differentiate side to side, they cannot differentiate front to rear. Both fornt and rear transfer case output shafts have to turn at the same speed and that is why there is binding.

alitterit · August 9, 2011

First, thanks for all the replies. Now I know what everyone does while at work haha... now It is starting to make sense but It brings me to another question.

If the rear will differentiate speed between the two wheels, why would the inside tire seem to be the one that's moving the truck (spinning slightly) and not the outside.

By the rear acting as if it were a spool I mean both tires spinning the same speed even when turning causing the inside tire to spin.

kdixer · August 9, 2011

First, thanks for all the replies. Now I know what everyone does while at work haha... now It is starting to make sense but It brings me to another question.

If the rear will differentiate speed between the two wheels, why would the inside tire seem to be the one that's moving the truck (spinning slightly) and not the outside.

By the rear acting as if it were a spool I mean both tires spinning the same speed even when turning causing the inside tire to spin.

Because in a turn, the outside tire has to travel more distance than the inside tire. It is easier for the inside tire to spin than push the vehicle to match the speed it needs to turn to keep pace with the outside wheel. With a little bit of speed, more weight is transfered to the outside tires as well.

Matt_ · August 9, 2011

So how can you tell its acting like a spool by hanging out the window? You'd need to see both tires at the same time.

Its not the G80 if it only does it in 4low. Fact. That's like saying your check engine light comes on every time you flush the toilet in your house... they're so unrelated it just not happening.

ChevyTech77 · August 9, 2011

G80's do not lock over 20 mph as well. If using 4LO under 20 mph then yes, the G80 will stay locked and possibly cause more binding but the binding that you speak of sounds like normal 4WD on dry pavement binding to me.

alitterit · August 9, 2011

OK, now I get whats happening. It is in fact binding, and the that binding is released at the rear of the truck just due to how the drivetrain is set up, less weight/traction of the rear wheels. I knew it didn't have anything to do with the G80 just saying that it was engaged in 4lo was the easiest way I could think of to explain it.

matt, what I meant by that was that when I turned the truck the inside tire was spinning ever so slightly as if it were going the same speed as the outside wheel. on an open rear that shouldnt happen so that's why I said it was acting almost as if it had a spool. (again easiest way I could think to explain it)

(for anyone that does not know what a spool does, it basically locks both axles together and does not allow one wheel to spin faster/slower then the other. Both of the wheels turn the same RPM no matter what. Think sport ATV rear axle.)

again thanks for the replies!