Works like a truck, rides like a car...

And was later known on the 4WD models as TTB (twin traction beam). That was the hot ticket for Baja racing due to the large amount of front wheel travel you could get with an extremely durable 4WD system and as good of a ride as IFS.
 
TwinTractionBeamGraphic.jpg


That's the 150/Bronco version, HD trucks had leaf springs.

Article about the 4x4 version of the twin beam on Hemmings -

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