Anonymous-0
Well-known Member
I sometimes see different descriptions or names for four wheel drive, what do they mean?
- Thread starter Anonymous-0
- Start date
Huh? I know Ford marketed the Mercury Mountainer as all wheel drive and four wheel drive. The difference was the all wheel drive was a single speed always engaged system. The four wheel drive had a two speed transfer case that could be shifted in or out of four wheel drive. This however may just be Fordspeak and other manufacturers may use the same nomenclature differently.
On tractors it's pretty simple. 4X4s or 4 wheel drive are generally considered to be large full time four wheel drive intended for heavy tillage work on large acerage. MFWA (mechanical front wheel assist) looks pretty much like a row crop and has on demand front wheel assist on most models with other being full time or hydraulic drive and are just FWA. They are able to do row crop work like cultivating.
On cars and trucks 4x4, 4WD or any other discription is any vehicle able to drive on all 4 wheel including on demand, full time and auto.
Hope this helps.
Rick
On cars and trucks 4x4, 4WD or any other discription is any vehicle able to drive on all 4 wheel including on demand, full time and auto.
Hope this helps.
Rick
FWD (four wheel drive) AWD (all wheel drive) and there is Full time four wheel drive.
Just different names, from manufacturers, for basically the same thing.
It should be noted that to have (TRUE) Four Wheel Drive, the transfer case, the front defferential and the rear deferential must be of locking type.
Rear locking defferential is pretty common but not front.
Just different names, from manufacturers, for basically the same thing.
It should be noted that to have (TRUE) Four Wheel Drive, the transfer case, the front defferential and the rear deferential must be of locking type.
Rear locking defferential is pretty common but not front.
F W D can also mean Front Wheel Drive. IE Most mini vans
I get a lot of people wanting tow cars for behind Motor homes.
To flat tow (All four wheels down and not on a tow dolley) a four Wheel Drive behind a motor hope it myst have a transfer case that has a netural position!
The full time and "on demand" type with out netural on the transfer case cannot be flat towed!
I get a lot of people wanting tow cars for behind Motor homes.
To flat tow (All four wheels down and not on a tow dolley) a four Wheel Drive behind a motor hope it myst have a transfer case that has a netural position!
The full time and "on demand" type with out netural on the transfer case cannot be flat towed!
ShadetreeRet
Well-known Member
Four wheel drive, as you indicated, is activated by a transfer case. All Wheel Drive, is an entirely different setup, which is more of a hydraulic drive to each wheel. As someone already pointed out, FWD can stand for four wheel drive or front wheel drive, depending on the vehicle.
MarkB_MI
Well-known Member
- Location
- Motown USA
You talking about motor vehicles or tractors? For cars and trucks, an "all-wheel drive" system is always engaged and uses a third differential to split power between the front and rear axles. An "automatic four wheel drive" system engages the front axle only when the rear is slipping. AWD systems normally don't have a low range. Most automatic FWD systems can be locked into 4WD or 2WD modes in addition to automatic, and usually have a low range as well.
chevytaHOE5674
Well-known Member
If you are talking about motor vehicles then I have never seen one with hydraulic drive to the wheels.
AWD cars/trucks use a transfer case but it has a differential in it as stated to allow the power to be transferred on a less than 50/50 split.
"FWD" is copyrighted and protected by the FWD Corporation of Clintonville, Wisconsin. Manufacturers of four wheel drive or front wheel drive vehicles cannot use FWD to describe the drive train of their vehicle although I have seen it used in dealers ads in newspapers to desribe a front wheel drive vehicle. That's why the badging on various four wheel drive vehicles will say something like "4WD" or "4X4". The only vehicle you will ever see "FWD" badging from the factory on are those big trucks used mainly to plow or blow snow. FWD Corporation spends 99.99% of their time manufacturing Seagraves fire engines today.
MarkB_MI
Well-known Member
- Location
- Motown USA
FWD Corp may have a registered trademark, but having a trademark does not mean it's enforceable. Commonly-used three-letter acronyms are notoriously hard to defend in court.
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