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The Quadratrac is a 4wd on demand system that uses a viscous coupler to drive the front axle when there is a difference in speed that will cause it to slip. When the coupler slips, the fluid in it heats up and makes a more positive drive connection.
Lots of people swears at them and lots of people swears by them. They would seem to require more attention to maintenance than you could probably get away with on a selectrac system. The weak spot most people complain about is the coupler, though there is no talk of the previous maintenance practices, tire selection, replacement and maintenance etc..
The selectrac has the 2wd/4hi/N/4lo selector and the driver picks his drive mode.
As to which is better, that is up to the users experience. Dale has his preference for some very good reasons - some operational, some repair related and some maintenance related no doubt.
Some of these reasons may not reveal themselves untill you actually own and use the system.
My Quadratrac has been good so far. No repairs - just change the oil both springs I've had it (now using synthetic) and go. It is good for my wife to drive in winter without worrying about shifting except for the transmission.
That said, I sure wouldn't turn down a Jeep model with selectrac either.
JD
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