Difference between 4High and 4High Lock
 

New H3 owner. I know this is probably a dumb question. If the H3 is full time all wheel drive, what is the difference between 4 High and 4 High Lock? I have a base model without the locking diff.

I also used 4 Low Lock the other day. The trans was pretty darn loud. Is that normal?

Re: Difference between 4High and 4High Lock
 

Anytime you want to do more than 25MPH, 4 hi lock. Under 25 MPH, 4 lo lock.

4 lo lock in 1st or 2nd gear. Very noisy.....normal.

Re: Difference between 4High and 4High Lock
 

Thank you for the reply. What about the difference between regular 4 High and 4 High Lock? Again I have a base model w/o the locking diff.

Re: Difference between 4High and 4High Lock
 

4 hi power distributed approx 40/60 f/r open diffs 4 hi lock 50/50 center diff locked equal power all four wheels

Re: Difference between 4High and 4High Lock
 

4 High Open - provides a constant 40%/60% front/rear torque split

4 High Lock - allows a 50%/50% split front/rear for more slippery surfaces

Re: Difference between 4High and 4High Lock
 

Thanks. Good to know!

Re: Difference between 4High and 4High Lock
 

Welcome lexunet! :cool:

Whereabouts in CA are you?

Re: Difference between 4High and 4High Lock
 

Thanks for the welcome. I live if Fresno.

Re: Difference between 4High and 4High Lock
 

Cool, you'll have to come out wheeling with us sometime. There's a bunch of us in NorCal (and a couple SoCal folks we let tag along ;) ). I've been wanting to hit some of the trails around the Shaver Lake area.

Re: Difference between 4High and 4High Lock
 

welcome!

4hi lock is for snow/mud

4 lo lock is for rocks/steep descent etc....:D

Re: Difference between 4High and 4High Lock
 

X2

i was gonna say that :p :p ;) ;) :D

Re: Difference between 4High and 4High Lock
 

4-Lo Lock is also used for pulling Jeeps out of deep rivers, quicksand, etc.:D

Re: Difference between 4High and 4High Lock
 

LOL:D :D

Re: Difference between 4High and 4High Lock
 

LMAO!! :D :D That should be in the manual.

Re: Difference between 4High and 4High Lock
 

Thanks again for all the welcome. I would love to try out some trails near Shaver Lake sometime!

I don't want to be the kind of guy that never uses his Hummer for what it was intended to do... go anywhere!

Re: Difference between 4High and 4High Lock
 

good you want to break that truck in right with a getting to know dirt party

Re: Difference between 4High and 4High Lock
 

Technically, there is no torque split when locked, because it is no longer a differential. For example, if the front encounters a slippery surface, torque will be transmitted to the rear up to 100%, and vice versa.

Michael.

Re: Difference between 4High and 4High Lock
 

Two things comes to Mind!

1. WTF were you thinking With? :eek: :)----Pretty Damn Loud!----- in Low LOCK! :eek: :o

2. The **** eating Grin Must of Affected the Thought process!....

READ YOUR MANUAL!!! :D

Re: Difference between 4High and 4High Lock
 

Dirt Good. Detergent Bad!!:popcorn: