Originally Posted by LILBLUE04FX4L2
I believe that TTB = twin traction beam and deals with the drive system and not the suspension
The TTB system pertains to both the drive-train and the suspension. TTB is the 4x4 version of twin I-Beam. One of the two 'beams' actually contains the differential. That beam has a partially enclosed drive axle, very solid-axle like. The passenger side is driven by an exposed drive axle. Both sides have U-joints. There are no CV's like there are on the newer IFS trucks.
IFS on the other hand can be sprung by either t-bar or coil springs.