Re: Cranking the Torsion Bar???


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Posted by Ben (64.121.48.151) on 18:15:54 07/11/07

In Reply to: Cranking the Torsion Bar??? posted by kcburb

: '95 K1500
:
: I posted an earlier topic looking at putting 265's on my truck. A response talked about cranking the torsion bar. What does that mean?
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Both 2WD and 4x4 uses round bar that is twisted (torsion) to suspend the front end off the pavement.

2WD drive has a coil spring and as it's compressed or extended, the steel rod twists ever so slightly.

4x4 has a straight bar spring and very short compared to the coil spring. It's held at the frame
cross member and other end at the lower A-Arm close to it's pivot point.

There is a pre-load set at the frame cross member (underneath the drivers seat, or there abouts).
A set screw/bolt pushes against a lever arm on that end of the torsion bar. That in turn twists
the lower A-Arm down.

By "cranking the torsion bar", they mean to tighten that set screw/bolt at the torsion bar end
at the cross member.

This will twist it more and force the lower A-Arm down and lift the front end.

Since the bar is twisted more, it's under more tension and will ride harsher.

Both ends of the bar have a 'hex' head and fits into a mating hex hole. At the cross member end
there is a lever arm that the adjusting set screw/bolt pushes against. This lever arm is called a "key".

Some use Ford keys because they have more angle and will take less turns of the set screw/bolt.

Image above is from Ready Lift and shows what a 'key' looks like.





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