I believe the 4 was added to later units.
The STS AWD and STS4 are the same. The 4 has been part of the STS emblem since day one if you have the AWD option. If your car has AWD and doesn't have the 4 next to the STS emblem, then it was removed.I have an '06 STS AWD and I wonder if anyone has a definitive answer as to what makes it different from an STS4.
That's weird because I've seen more AWD STS's without the 4 than with it on dealers lots. Why would the dealer remove the 4?The STS AWD and STS4 are the same. The 4 has been part of the STS emblem since day one if you have the AWD option. If your car has AWD and doesn't have the 4 next to the STS emblem, then it was removed.
A 4 wheel drive vehicle has no center differential, just a transfer case. The four wheel drive should not be used on paved roads. AWD vehicles like the STS option have a center differential. This allows all the wheels on the car to travel at the different speeds required to negotiate a corner on a paved road. The STS center differential also gives a 40-60 torque split between the front and rear. My guess is that the 4 was added to later units.Actually the all wheel, 4 wheel drive thing is very confusing.
It really simply has to do with the configuration of whatever system they use.
I think adding the 4 to the AWD option vehicle was a mid year change.
I think all the newer STS and SRX with this option have the STS4 logo on them.
Which wheel "gets the power" depends on how you drive it.
I am not too familiar with the specific hardware they use on that vehicle since I don't deal with those systems a lot.
4WD is typically used to describe something with a selectable feature like "auto 4WD" or hi or low ranges.
Don't ask me for specifics because frankly I think the whole automotive industry is confused about this AWD, 4WD business.
Cadillac does refer to our systems as AWD.
Ref: page 4-194 '06 STS FSM, The Borg warner(BW) model 4479, transfer case is a one-speed, all wheel drive(AWD), transfer case. The transfer case provides power to both axles through an external planetary type differential, which has 2 different sets of pinion gears. The planetary differential provides a 40/60 torque split, front/rear, full time... The BW 4479 design of the planetary differential allows the use with the vehicle stability enhancement system(VSES) vehicles. I see no mention of a viscous clutch.I think part of an above statement is right.
I don't recall seeing an AWD STS without the 4.
I was thinking of the SRX when I said they added the 4 mid year.
The AWD SRX did not have the 4 until recently.
I don't know why someone would remove the 4.
Is your STS AWD a V8 or a V6?
The ones I have seen with the 4 are V8's.
GM transfer cases almost all use a "viscous clutch" inside the transfer case (what you seem to refer to as a "differential", to compensate for rotational speed differences. I can't really say much more.
I have no love for AWD or 4WD.
What's strange here is that the "4"s that I remember seeing are larger than the one in the picture. In fact they are the same height as the STS. Is there a chance that the "4"s were added by dealers to enhance the sales?I wouldn't know why either as to why they want to take the "4" emblem off, really doesn't make any sense. However, the "4" has always been there for the AWD version of the STS. It wasn't until 2006 that they added the AWD "4" option to the V6 models. The V8 models had it as an option since they came out in late 2004. Here is a picture of a 2005 STS AWD. You can see the whole ad on ebay.
I bought it new from a dealer and it had 49 miles on it. They had another on the lot with no "4" on it and one with a large "4". The window sticker says all wheel drive for $1900 extra. The tag on the spare tire cover lists the five speed automatic RPO MV3 which is specific to the AWD option and RPO MX7 AWD. I've been underneath it and it has a front drive shaft, a front differential and drive axles. It has a Northstar V8 and the performance is prodigeous.hmmm....i don't know. That seems really strange if they would do that to increase sales. I haven't seen one any larger than what is on the car from the factory. It's really strange that yours is an AWD w/out the "4". Did you buy it new or used??
New Venture is the merger of the old GM Muncie plant combined with Chrysler's New Process transmissions. That's the old Jeep Quadra-trac Morse chain fiasco.The borg warners do use an open planetary gearset.
The New Venture gear cases use a viscous clutch. (typically).
The 4 is offset downward... not sure why.