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The titan (4wd) is equipped with a coil-over shock type front suspension system. There are no torsion bars. SImply insert the coil spacer and it raises the front of the truck by whatever the thickness of the spacer is. The spacer basically lengthens the front shocks.
As for the 2wd trucks, i haven't paid much attention to their setup because, in my opinion, its foolish to purchase a 2wd truck, at least in my part of the country(pennsylvania) where 4wd is an absolute must for wintry conditions. I can say that they probly wouldnt have put coil-overs on the 4wd's and not the 2wd's.
Oh yeah, you can't use a coil spacer on a torsion bar suspension system, because there are no coils!!! All that is there is the shock and the torsion bar.
As for the reason that the coil spacer lift is for the front only, is basically to "level" the truck. At stock stance, the truck sits a bit lower in the front than the rear, and the coil spacer lifts the front to match the stock back height.
Hope this helps.
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