Simple question??? i hope - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rlcasey75 · 06-10-2009, 06:01 PM

Ok what is the difference between 4h and 4h lock also 4L and 4L lock????? i am new at this 4 wheel drive stuff and trying to learn everything i can.

Eturnit3 · 06-10-2009, 06:13 PM

hmm, good question. Im no expert and would love to hear an experts explanation. My best guess is that 4hi vs 4hi lock would be something to do with an independent front and rear shifting ( like this http://www.jbfab.net/ ), I know its referred to as "locking out the front" when you lock the front driveshaft, spin the rear tires to help position yourself for an obstacle, and vise versa for the front. Who knows tho, I may be way outta line and it could be the same thing...

Eturnit3 · 06-10-2009, 06:15 PM

Oh another possibility would be, if you switch your transfer case into 4hi and dont lock you hubs. that may be considered 4hi versus locking your hubs, which would be 4hi lock?

rlcasey75 · 06-10-2009, 06:22 PM

ok well i have a fulltime NP203 transfer case so i dont have locking hubs.

Eturnit3 · 06-10-2009, 06:25 PM

and it shows a difference in shift pattern or what? I would think there wouldnt be any difference then between 4 low and 4 low lock but like I said Im no expert here... Im sure you'll get the explanation your lookin for, tons of knowledgeable guys on this site.

Dooley · 06-10-2009, 07:05 PM

The full time four wheel drive 203 transfer case has an "interaxle differential",(planetary gear arrangement), that allows for the front and rear outputs to turn at different speeds.
Here, this it explains it better.

Eturnit3 · 06-10-2009, 07:10 PM

thats the explanation you were lookin for.. learn somethin new everyday!!

rlcasey75 · 06-10-2009, 07:14 PM

ok yeah that helps thanks do you have a link to this or anything.

72 CustomCamper · 06-10-2009, 11:30 PM

Quote:

Originally Posted by Dooley

The full time four wheel drive 203 transfer case has an "interaxle differential",(planetary gear arrangement), that allows for the front and rear outputs to turn at different speeds.
Here, this it explains it better.

Actually it's a Spider gear arrangement. There are no planetary gears in an NP203...

rlcasey75 · 06-10-2009, 11:32 PM

ok so what does this mean

72 CustomCamper · 06-10-2009, 11:56 PM

Basicly you have 3 differentals in the truck. 1 in the front end. 1 in the rear end. And 1 in the transfer case. While in 4 hi or 4 low all 3 diffs are working. When you shift into 4 hi loc or 4 low loc you are locking the diff in the transfer case to send equal power to the front and rear ends...

Chuck

rlcasey75 · 06-11-2009, 10:42 AM

ok thanks that explains what i needed to know

Prerunner1982 · 06-11-2009, 11:16 AM

Quote:

Originally Posted by rlcasey75

ok so what does this mean

In 4H and 4L you can go from dirt to paved roads without binding the driveline. The differential in the tcase allows some slip between the front and rear drivelines.

In 4H Lock or 4L Lock the front and rear drivelines are locked together and driving on pavement with cause binding and damage.

fun in dirt · 06-11-2009, 03:53 PM

Quote:

Originally Posted by Prerunner1982

In 4H and 4L you can go from dirt to paved roads without binding the driveline. The differential in the tcase allows some slip between the front and rear drivelines.

In 4H Lock or 4L Lock the front and rear drivelines are locked together and driving on pavement with cause binding and damage.

Now that makes more sense!!!

**special-K** · 06-12-2009, 07:28 AM

4h-loc/2H-loc = conventional 4wd without free-wheeling/locking hubs.

06-10-2009, 06:01 PM	#1
rlcasey75 BoomerSchooner75 Join Date: May 2009 Location: Mountain Home ID Posts: 96	Simple question??? i hope Ok what is the difference between 4h and 4h lock also 4L and 4L lock????? i am new at this 4 wheel drive stuff and trying to learn everything i can.

06-10-2009, 06:13 PM	#2
Eturnit3 Bloodied Knuckles Join Date: Jan 2009 Location: Grass Valley CA Posts: 273	Re: Simple question??? i hope hmm, good question. Im no expert and would love to hear an experts explanation. My best guess is that 4hi vs 4hi lock would be something to do with an independent front and rear shifting ( like this http://www.jbfab.net/ ), I know its referred to as "locking out the front" when you lock the front driveshaft, spin the rear tires to help position yourself for an obstacle, and vise versa for the front. Who knows tho, I may be way outta line and it could be the same thing...

06-10-2009, 06:15 PM	#3
Eturnit3 Bloodied Knuckles Join Date: Jan 2009 Location: Grass Valley CA Posts: 273	Re: Simple question??? i hope Oh another possibility would be, if you switch your transfer case into 4hi and dont lock you hubs. that may be considered 4hi versus locking your hubs, which would be 4hi lock?

06-10-2009, 06:22 PM	#4
rlcasey75 BoomerSchooner75 Join Date: May 2009 Location: Mountain Home ID Posts: 96	Re: Simple question??? i hope ok well i have a fulltime NP203 transfer case so i dont have locking hubs.

06-10-2009, 06:25 PM	#5
Eturnit3 Bloodied Knuckles Join Date: Jan 2009 Location: Grass Valley CA Posts: 273	Re: Simple question??? i hope and it shows a difference in shift pattern or what? I would think there wouldnt be any difference then between 4 low and 4 low lock but like I said Im no expert here... Im sure you'll get the explanation your lookin for, tons of knowledgeable guys on this site.

06-10-2009, 07:05 PM	#6
Dooley Registered User Join Date: Mar 2005 Location: North Coast Posts: 1,012	Re: Simple question??? i hope The full time four wheel drive 203 transfer case has an "interaxle differential",(planetary gear arrangement), that allows for the front and rear outputs to turn at different speeds. Here, this it explains it better. Attached Images

06-10-2009, 07:10 PM	#7
Eturnit3 Bloodied Knuckles Join Date: Jan 2009 Location: Grass Valley CA Posts: 273	Re: Simple question??? i hope thats the explanation you were lookin for.. learn somethin new everyday!!

06-10-2009, 07:14 PM	#8
rlcasey75 BoomerSchooner75 Join Date: May 2009 Location: Mountain Home ID Posts: 96	Re: Simple question??? i hope ok yeah that helps thanks do you have a link to this or anything.

06-10-2009, 11:32 PM	#10
rlcasey75 BoomerSchooner75 Join Date: May 2009 Location: Mountain Home ID Posts: 96	Re: Simple question??? i hope ok so what does this mean

06-10-2009, 11:56 PM	#11
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,368	Re: Simple question??? i hope Basicly you have 3 differentals in the truck. 1 in the front end. 1 in the rear end. And 1 in the transfer case. While in 4 hi or 4 low all 3 diffs are working. When you shift into 4 hi loc or 4 low loc you are locking the diff in the transfer case to send equal power to the front and rear ends... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!" Last edited by 72 CustomCamper; 06-10-2009 at 11:56 PM.

06-11-2009, 10:42 AM	#12
rlcasey75 BoomerSchooner75 Join Date: May 2009 Location: Mountain Home ID Posts: 96	Re: Simple question??? i hope ok thanks that explains what i needed to know

06-12-2009, 07:28 AM	#15
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Simple question??? i hope 4h-loc/2H-loc = conventional 4wd without free-wheeling/locking hubs. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

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