The power boost system off a mid-70's Ford Granada uses the frame-mounted cylinder tied into the tie rods, and a direction-sensing valve on the Pitman arm. It could probably be adapted to the straight axle system with a little creative engineering.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!