Ratchickens
Active member
I was reading through the manual and I was wondering if there is anyway to know if the Front Axle Disconnect feature is working. I was thinking those of us getting worse gas mileage may not be having this feature kick in.
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Front Axle Disconnect Feature
- Thread starter Ratchickens
- Start date
It is on all 4x4 models.
Jim1234664
Active member
the old grand cherokee was locked all the time. no option to unlock. These are RWD most of the time with the option to lock very quick when needed. It may also lock momentarily setting off from a stop. There is also logic to lock more when wipers are on, steering wheel is turned etc.
It tries to stay unlocked as much as possible for gas mileage
It tries to stay unlocked as much as possible for gas mileage
freethinked
Well-known member
Is there a difference between unlocked and disconnected? I thought there was. Locked = 4wd power goes to wheel with traction, unlocked = awd where power goes to wheel losing traction, disconnected = rwd best gas mileage.
Jim1234664
Active member
I was mistaken,
here is the differences:
Quadra-Trac I uses the New Venture Gear NV140 transfer case. It has no low range or two-wheel-drive mode, so there is no shift lever or button. 2021 Grand Cherokee L Laredo and Limited models are equipped with the Quadra-Trac I system.
Quadra-Trac II also has a low range with 2.72:1 gearing for more severe off-roading; hill-descent control, which keeps the vehicle at a constant speed on steep off-road descents; and a neutral range which allows the Grand Cherokee L to be towed on all four wheels without disconnecting the drive axles. Quadra-Trac II is the standard four-wheel-drive system on the 2021 Jeep Grand Cherokee L Overland.
Like Quadra-Trac II, Quadra-Drive II has user-selectable low and neutral ranges, as well as hill-descent control. Quadra-Trac II is standard on the top-of-the-line Grand Cherokee L Summit model and can be added to the Overland model as part of the Off-Road Group option package.
source: https://www.motortrend.com/news/2021-jeep-grand-cherokee-l-four-wheel-drive-system-differences/
here is the differences:
Jeep Quadra-Trac I
Quadra-Trac I is a single-speed full-time all-wheel-drive system that requires no driver intervention. Four-wheel-drive is always engaged, with 48 percent of the engine's torque delivered to the front axle and 52 percent going to the rear. Quadra-Trac I uses open differentials and relies on the traction control system to distribute power by way of the SUV's brakes. If a wheel loses traction, the system senses the wheelspin and applies the brake to that wheel.Quadra-Trac I uses the New Venture Gear NV140 transfer case. It has no low range or two-wheel-drive mode, so there is no shift lever or button. 2021 Grand Cherokee L Laredo and Limited models are equipped with the Quadra-Trac I system.
Jeep Quadra-Trac II
The Quadra-Trac II system uses the NV245 transfer case, which adds an electronically-controlled clutch pack to the center differential. Like Quadra-Trac I, this system sends 48 percent of the engine's torque to the front axle and 52 percent to the rear, but unlike its simpler sibling, the clutch pack can change that ratio, sending up to 100 percent of the engine's twist to either axle. Several sensors detect wheel slip and shift power forward or rearward as needed. As in the Quadra-Trac I system, Quadra-Trac II features open differentials and a brake-based traction control system.Quadra-Trac II also has a low range with 2.72:1 gearing for more severe off-roading; hill-descent control, which keeps the vehicle at a constant speed on steep off-road descents; and a neutral range which allows the Grand Cherokee L to be towed on all four wheels without disconnecting the drive axles. Quadra-Trac II is the standard four-wheel-drive system on the 2021 Jeep Grand Cherokee L Overland.
Jeep Quadra-Drive II
Jeep's top-of-the-line Quadra-Drive II four-wheel-drive system uses the same NV245 transfer case as the Quadra-Trac II setup and adds electronically operated limited-slip differentials to both front and rear axles. Each LSD has its own clutch pack, and if traction is lost at one wheel, power is shifted to the other. While Quadra-Trac II can shift power to the axle with the most traction, Quadra-Drive II can shift power to the wheel with the most traction, and therefore is less reliant on the braking system to arrest wheel-slip. Quadra-Drive II is also programmed to anticipate low-traction situations and make proactive adjustments.Like Quadra-Trac II, Quadra-Drive II has user-selectable low and neutral ranges, as well as hill-descent control. Quadra-Trac II is standard on the top-of-the-line Grand Cherokee L Summit model and can be added to the Overland model as part of the Off-Road Group option package.
source: https://www.motortrend.com/news/2021-jeep-grand-cherokee-l-four-wheel-drive-system-differences/
Ratchickens
Active member
That was my impression as well. The only time I see locked is when I’m 4 wheel low.
Sarge
Well-known member
The Qudratrac II system can vary the torque up to 100% to either axle. I would love it SO much if I could add a 'donut' mode to the 'programs'; disconnect the stability control, ABS and front axle with one button? YES PLEASE.
From what I've read on the WK/WK2 you can't even totally disconnect the stability control unless you either pull a bunch of fuses, or install an interrupt switch to some purple wire under the center console/tunnel. I hope someone figures out what the solution is on the WL soon. Winter is here! 😆
From what I've read on the WK/WK2 you can't even totally disconnect the stability control unless you either pull a bunch of fuses, or install an interrupt switch to some purple wire under the center console/tunnel. I hope someone figures out what the solution is on the WL soon. Winter is here! 😆
I'm a bit confused by the 4WD system on the Limited. The manual describes the 4WD as "on demand," which sounds more like AWD to me, but I could be misinterpreting that phrase. I noticed in the off-road pages of the Uconnect system that my 4WD high indicator seems to go off at speeds above ~ 35 mph. See below. Not sure if it's an electrical bug, or if 4WD is indeed disengaging at higher speeds, as, for example, the Toyota Rav4 does. Does anyone know why the yellow 4WD high indicator would turn off? I couldn't find anything in the manual.
Attachments
freethinked
Well-known member
Probably because it won’t let you switch to low at that speed.
Ratchickens
Active member
I’m think that the indicator turning off is the front axle disconnecting. I see I happen at freeway speeds. As a test to flipped to snow mode and the light came back on.