4x4 vs. AWD vs. 4WD - Page 2 - Jeep Garage - Jeep Forum

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  #13  
Old 05-26-2016, 03:09 PM
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Re: 4x4 vs. AWD vs. 4WD

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Originally Posted by perry8912 View Post
So, 4wd should be better then 4x4? Cause it can save some gas by choosing 2wd or 4wd manually?
Those are all marketing terms that essentially mean nothing by themselves.
There is common usage where 4wd and/or 4x4 imply that there is a low range available with or without locking differentials, and AWD is used more for vehicles without a low range--e.g. crossovers, Audis, Jensen Interceptors.

Yes, a selectable 2wd/4wd can save gas--a bit, and possibly a bit less wear and tear on the front end drive train. A 4wd with different gearing can do the same thing.
2wd/4wd models rarely have the type of front/rear differentials that can tolerate operation on anything but loose surfaces for very long in 4wd mode--dunno if they still detonate or not.

A huge advantage of AWD or all time 4WD is handling, particularly in ordinary driving situations, rain, mild snow, etc. Thats why even Ferrari offers it.

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Old 05-27-2016, 07:37 AM
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Re: 4x4 vs. AWD vs. 4WD

Ferrari LMAO! Performance vehicles leverage AWD so they get traction at launch. Try sending way too much HP to the rear (or front) of a lightweight vehicle. Instant wheelspin. That's why the tires are huge and sticky... more surface area to hook up. AWD gives even more surface area since power gets distributed to all wheels. Where it gets interesting is with crossovers and modern SUVs. I personally don't like computers controlling the outcome of my 4WD, and haven't found any modern day vehicle that made me feel safer than the old skool predictable manually locked diffs. But, it's just my opinion, and like bellybuttons, everybody has one... for some, the proper use of 4WD systems is complicated, or messy, so manufacturers make it easy, and take away the control from the driver. IMHO, learn to drive the vehicle. AWD, 4WD, 4x4, it only helps you go, not stop, and so many snowy wrecks are from idiots with overconfidence. Everything including tire tread design and tire pressure are factors, and makes no two vehicles the same. My wife drives AWD crossover, I have an old CJ7 4x4, or a front wheel drive commuter box..lol. Education, and experience. Proceed with caution.
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Old 05-27-2016, 09:16 AM
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Re: 4x4 vs. AWD vs. 4WD

AHA!!! I found this web site that give a more betterer explanation than any I've seen. Take a look.
Jeep's AWD and 4WD Systems Explained
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Old 05-27-2016, 05:08 PM
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4x4 vs. AWD vs. 4WD

Looks like some good general info in that article but some of it is wrong. It states that only QT2 has low range and is the most capable, that isn't correct. QD2 also has low range and the locking rear elsd makes it more capable. There are some YouTube clips showing GCs with different systems doing hill climbs.
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Old 05-27-2016, 05:14 PM
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Re: 4x4 vs. AWD vs. 4WD

I always thought AWD was all 4 wheels are powered all of the time, with no option to switch to RWD. I took 4x4 as having the capability of going into 4x4 mode, but also having 4x2 capability. 4x4 & AWD are the only two titles I've seen used for cars, I've never seen an emblem with 4WD on a car..so idk if 4WD would refer to AWD or 4x4.
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Old 05-27-2016, 05:47 PM
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Re: 4x4 vs. AWD vs. 4WD

Subaru used the 4WD emblem for many years.
Generally speaking, AWD vehicles have no transfer case. Most of them are based on FWD platforms, and only drive the front wheels most of the time. They usually have some type of electronically controlled center clutch or differential that sends power to the rear wheels when needed. This is how most modern AWD cars and crossovers work.

Many vehicles labeled 4X4 have a transfer case with a low range. If there is no low range, there is no need for a transfer case. Also, not all 4X4's are part time...for example, with the Toyota FJ, the 6 speed manual has a full time 4X4 T-case (with low range), while the automatic comes with a part-time 4X4 T-case (also with low range). This means the 4WD shift lever (some vehicles like the Jeep use an electronic switch) has a 2Hi, 4Hi, N, and 4Lo position, where the manual trans model only has 4Hi, 4Hi-lock N and 4Lo.
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Old 05-27-2016, 07:50 PM
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Re: 4x4 vs. AWD vs. 4WD

So, after all these postings, and all seemingly knowledgeable people sharing their knowledge (?) I still don't know how my Grand Cherokee Overland HA 4x4 actually operates. In Auto, is the drive split approximately 40 front/ 60 rear? Is the front axle open and free except when rear slippage is detected or is there always some power to the front? Is the power split between just the two axles or also between left and right on the same axle? Does anybody really really know the facts or are some of you just guessing? I can't believe I cannot get a straight, genuine factual answer!!
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Old 05-27-2016, 08:51 PM
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Re: 4x4 vs. AWD vs. 4WD

Quote:
Originally Posted by englanderm View Post
So, after all these postings, and all seemingly knowledgeable people sharing their knowledge (?) I still don't know how my Grand Cherokee Overland HA 4x4 actually operates. In Auto, is the drive split approximately 40 front/ 60 rear? Is the front axle open and free except when rear slippage is detected or is there always some power to the front? Is the power split between just the two axles or also between left and right on the same axle? Does anybody really really know the facts or are some of you just guessing? I can't believe I cannot get a straight, genuine factual answer!!
englanderm, it wasn't apparent what level of detail you were looking for as you only asked what the difference between 4x4/4wd/awd was. So here is more detail (no guessing):

Your Jeep either has Quadra Trac II or Quadra Drive II (Quadra Drive is only available with the Hemi and adds limited slip front/rear axles). Both are full time awd that have a 2.72:1 low.

Quadra-Trac II was introduced in 1999 and it employs a two-speed chain-driven transfer case featuring three modes of operation, "4-All Time", "N" or neutral, and "4-Lo". In "4-All Time", torque is applied to the rear wheels under normal driving conditions. If the rear axle starts rotating at a significantly higher rate than the front axle, hydraulic pressure builds up in the gerotor and causes the clutch pack to progressively transfer torque to the front axle until both axles return to the same speed. "N" or neutral mode is intended for towing the vehicle. In "4-Lo", the front and rear axles are locked together through a 2.72 gear reduction ratio. In 2005 Jeep added traction control and replaced the New Venture Gear NV247 transfer case with the NV245 transfer case.

Selec Terrain is the round switch on your console. The settings are:
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  #21  
Old 05-27-2016, 08:53 PM
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4x4 vs. AWD vs. 4WD

I think it's explained at wk2jeeps.com if you look there for it.


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Old 05-27-2016, 08:57 PM
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Re: 4x4 vs. AWD vs. 4WD

Wow! Thanks so much. After all that, you gave a simple and clear description that even I can understand. I owe you one!
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  #23  
Old 05-27-2016, 09:39 PM
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Re: 4x4 vs. AWD vs. 4WD

You can download the full copy of the Owners Manual for your Jeep here: Jeep Grand Cherokee WK2 - Brochures, manuals and literature

It's over 600 pages long with a ton of useful information. The little Users Guide they give you with your Jeep is just a quick overview with very little useful or in depth descriptions of operation.

I also ordered a paper copy to keep in the glove box in case I need a refresher out on the road. My flip phone doesn't do the interwebs. You can order paper copies of the Owners Manual, Navigation, and Uconnect systems operation here: https://www.techauthority.com/
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  #24  
Old 05-28-2016, 09:17 AM
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Jeep will mail you a hard copy of the full version owners manual for free if you fill out your info at the link below.

http://www.jeep.com/webselfservice/j...intManual.html
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