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09-11-06, 07:20 PM
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#1 (permalink)
| | 250+ Club
Join Date: Mar 2003
Posts: 296
| Domestic 4x4 question
My dad has a 2005 GMC Sierra Denali. It has a full time 4wd system, and it has an auto locking rear diff. My 99 cruiser is also full time 4wd, so as I understand it... w/o center locked its "1wd", w/ center locked "2wd", and w/ center and rear its "3wd" assuming 0 traction situations.
How does the GMC system work? Is their a locking center? Can the locking rear be useless if the front wheels are left spinning, due to no locking center diff? I hope that if the front tires loose traction and just spin it doesnt leave the rear useless, but I wouldn't bet against it...
I ask because I recently had the truck in a muddy coal mine, and was starting to get worried about getting stuck. 
Anyone know the details of the GMC 4x4 system?
-Matt
EDIT: IH8MUD
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1999 UZJ100, 3O5s, Stock Rear Locker, Warn Fog Lights, Yakima Roof Rack
Last edited by 80and100cruisers; 09-11-06 at 07:28 PM.
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09-11-06, 07:52 PM
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#2 (permalink)
| | Site Addict
Join Date: Feb 2004 Location: Castle Pines, Colorado
Posts: 1,989
| Well, I have a 2004 GMC Sierra Z71. It has a locking rear diff, and it locks whether or not your 4WD is engaged (when there is slippage). I have gone up some rocky slopes on hunting trips w/o 4WD because the rear locker kicked in and got me where I needed to go. I do not think there is any center or front locker available from the factory on these; it seems to operate independently from the t-case.
Of course, the Denali may have some other options available, but surely it is the same drivetrain as mine.
Hope this helps...
__________________
2000 UZJ100
1985 FJ60
1988 FJ62
1991 FJ80
1992 CDN M101 1/4 ton with RTT setup
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09-11-06, 07:56 PM
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#3 (permalink)
| | Parts Geek, M1 Mechanic
Join Date: Mar 2003 Location: Herding cats.
Posts: 15,148
| Quote: |
Originally Posted by 80and100cruisers My dad has a 2005 GMC Sierra Denali. |
I'm sorry to hear that.
Is a cure in sight?
__________________ Original owner 93 FZJ80,locked,blown,water/methanol injected(like a WWII fighter aircraft),lifted,winched,snorkeled,slidered,Sleeed ,moneypit. Balanced on a pin head. 95 FZJ80 trail truck (hers), 94 FZJ80 320K with a knock and a lumpy old Dodge car.   http://i487.photobucket.com/albums/r...Gastrap063.jpg http://i487.photobucket.com/albums/r...frifles004.jpg | 
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09-11-06, 08:12 PM
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#4 (permalink)
| | Forum Lifer
Join Date: Feb 2006
Posts: 10,044
| Quote: |
Originally Posted by cruiserdan I'm sorry to hear that.
Is a cure in sight? | your killing me dan  lol .you took the words right out of my mouth | |
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09-11-06, 08:18 PM
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#5 (permalink)
| | ThinkTank Waterboy
Join Date: Mar 2003 Location: Boston MA
Posts: 12,978
| the intended workings of a GMC 4x4 system has no bearing on whether you will get stuck or not.
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Groveland MA 01834
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09-11-06, 08:23 PM
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#6 (permalink)
| | Forum Regular
Join Date: Jul 2006
Posts: 69
| Quote: |
Originally Posted by cbmontgo Well, I have a 2004 GMC Sierra Z71. It has a locking rear diff, and it locks whether or not your 4WD is engaged (when there is slippage). I have gone up some rocky slopes on hunting trips w/o 4WD because the rear locker kicked in and got me where I needed to go. I do not think there is any center or front locker available from the factory on these; it seems to operate independently from the t-case.
Of course, the Denali may have some other options available, but surely it is the same drivetrain as mine.
Hope this helps... |
Your locker kicks in and is automatic?! unless you have a detroit locker which isnt a factory option I beleive you ar talking about a Limited slip.
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I do understand, thats why I drive a Toyota
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09-11-06, 09:26 PM
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#7 (permalink)
| | Site Addict
Join Date: Sep 2005 Location: Las Vegas
Posts: 1,775
| Quote: |
Originally Posted by Toyminater Your locker kicks in and is automatic?! unless you have a detroit locker which isnt a factory option I beleive you ar talking about a Limited slip. | actually limited slip uses clutches and high revs (of the driveshaft) and is usually suited to high-performance racing. There are auto-locking diffs...just that toyota was smart enough not to use them
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"Those who would give up essential liberty to purchase a little temporary safety, deserve neither liberty nor safety." -Benjamin Franklin
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09-11-06, 09:33 PM
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#8 (permalink)
| | Forum Lifer
Join Date: Mar 2003 Location: Camas, WA USA
Posts: 4,526
| Quote: |
Originally Posted by cbmontgo Well, I have a 2004 GMC Sierra Z71. It has a locking rear diff, and it locks whether or not your 4WD is engaged (when there is slippage). I have gone up some rocky slopes on hunting trips w/o 4WD because the rear locker kicked in and got me where I needed to go. I do not think there is any center or front locker available from the factory on these; it seems to operate independently from the t-case.
Of course, the Denali may have some other options available, but surely it is the same drivetrain as mine.
Hope this helps... | The Denali is Fulltime 4WD, so surely it has a different Tcase/center diff than your PT 4WD GMC  Not that I really care what any GMC has in it
__________________ Ben Silva
IH8MUD Site Supporter since July 2004
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1993 FZJ80 198k miles Sold
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09-11-06, 10:03 PM
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#9 (permalink)
| | 250+ Club
Join Date: Mar 2003
Posts: 296
| Yea, Denali is fulltime 4wd. Rear has a locker that auto engages when it senses too much slip, or something like that. Just got me wondering if that also auto locks a center diff to ensure power goes to the rear, and doesn't just get sent forward to tires w/o grip.
I'd take my cruiser anyday, but that being said, I do enjoy the 340hp the truck has. As for my dad, hes a good sport, mom "stole" the 03 100.
-Matt
Edit:
I know one of you guys/gals knows the answer, out w/ it!
__________________
1999 UZJ100, 3O5s, Stock Rear Locker, Warn Fog Lights, Yakima Roof Rack
Last edited by 80and100cruisers; 09-12-06 at 03:58 PM.
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