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Apart from an official Daimler-Chrysler video, given to me by a Jeep dealer, which states that the QuadraDrive system will transfer 100% of engine torque to any one wheel, the wheel with the most grip, I have seen hardcopy literature making similar claims and also found numerous links to this on the net. Here are some of them.

From Daimler-Chrysler's promotional video on the WJ:
"One hundred percent of developed engine torque can be sent to just one wheel - the wheel with the most grip."
 

From Daimler-Chrysler's jeep.com web site:
"... the Quadra-Drive system can send nearly 100 percent of engine torque to a single wheel when necessary ..."
http://www.jeep.com/jeep_life/news/grand_cherokee/?context=sitemap&type=link
 

From Daimler-Chrysler's press kit:
"The Quadra-Drive system combines the Quadra-Trac II transfer case and Vari-Lok axles and is able to send nearly 100 percent of the developed engine torque to just one wheel, if necessary."
http://wwwsg.daimlerchrysler.com/SD7DEV/GMS/TEMPLATES/GMS_PRESS_KIT/0,2970,0-1-23222-1-1-text-0-22283,00.html
 

Lots more from various other sites:

"As mentioned, the Quadra Drive system can distribute up to 100% of the power to one wheel, if necessary."
http://ca.autos.yahoo.com/cd/tstdrv/2002jeepgrandcherokeeoverland.html
 

"The Quadra-Drive system combines the Quadra- Trac II transfer case and Vari-Lok axles and is able to send nearly 100 percent of the developed engine torque to just one wheel, if necessary."
http://www.rockcrawler.com/features/newsshorts/01september/2002Jeep/2002_grandchreokee.asp
 

"The new Quadra-Drive four- wheel-drive system is a work of genius, providing the wheel that has traction with up to 100 percent of available power."
http://www.edmunds.com/reviews/roadtests/roadtest/44304/article.html
 

"... the gerotor coupling can transfer nearly 100 percent of the developed engine torque to just one front wheel ..."
http://www.imajeep.com/2001%20Grand/4WD%20System/4WD_quadra_drive_system.htm
 

"It allows virtually a 100 percent transfer of developed engine torque to a single wheel on or off road to keep the Grand Cherokee moving while maintaining driver control when a traction situation looks almost hopeless. "
http://autos.msn.com/vip/jedlicka.aspx?make=jeep&model=grand%20cherokee&src=404
 

"... this full-time system in essence allows nearly 100 percent of available torque to be delivered to the wheel that has traction."
http://enquirer.com/columns/wheels/1998/08/082998av.html
 

"There, the gerotor coupling can transfer nearly 100 percent of the developed engine torque to just one front wheel, if necessary, to maintain traction."
http://www.jeepz.com/Glossary-kop-listletter-letter-Q.html
 

"This is the first system of its kind enabling 100% of the developed engine torque to be transferred to any one individual wheel without the use of electronics. Pretty neat huh?"
http://jeepsunlimited.com/zj/dbh/intro.htm
 

"Since Quadra-Drive is capable of transferring 100 % of the developed engine torque to any one wheel, even three wheels on ice would stop the all-new Grand Cherokee ."
http://www.geocities.com/seriousoffroad/jeepgallr.htm
 

"This allows the Quadra Trac II system to send up to 100 percent of engine torque to just one wheel, if the other wheels have no traction."
http://www.canadiandriver.com/testdrives/02grand_cherokee.htm
 

"It adds Vari-Lock Axles at the front and rear, so that if only one wheel has traction, it will allow almost 100% of the engine power to go that wheel."
http://www.canadiandriver.com/testdrives/00jeepgc.htm
 

"Essentially this system allows all the drive to be diverted to one wheel..."
http://www.bizplus.ie/bp_online/new_car_roadtests/?ns=36
 

"Quadra-Drive allows virtually 100 percent transfer of torque to a single wheel while driving on-or off-road, giving maximum control in any situation."
http://www.autowire.net/1999-23.html
 

"... so that if only one wheel has traction, it will allow almost 100% of the engine power to go that wheel."
http://www.nsnews.com/issues99/w112999/auto.html
 

"This industry-first allows virtually 100- percent transfer of developed torque to a single wheel..."
http://www.car-buying-strategies.com/2002-Jeep-Grand-Cherokee.html
 

"Its most sophisticated of the three - called Quadra-Drive - directs as much as 100 per cent of vehicle power to just one wheel if that's where the traction is."
http://online.statesmanjournal.com/sp_section.cfm?i=1605
 

"The Quadra-Drive 4WD system utilizes front and rear Vari-Lok axles that can transfer 100 percent of engine torque to a single wheel, keeping the Jeep moving along, provided one of the wheels has traction."
http://edmund.com/roadtests/longtermroadtests/1999/jeep/grandcherokee/44026/
 

"... new for 1999, was Jeep's permanently engaged Quadra-Drive, which could send 100 percent of the engine's power to any wheel at any time."
http://auto.consumerguide.com/auto/used/reviews/full/index.cfm/id/2381.htm
 

"... the gerotor coupling can transfer nearly 100 percent of the developed engine torque to just one front wheel ..."
http://www.mcguiganmotors.com/grand_cherokee_4wd.htm