Tightening the spindle nut when replacing torsion bars

[hemienvy]

I've read the correct method, when you replace torsion bars, is before you tighten the nut on the spindle shaft
you want the car back on the floor with the suspension loaded, then tighten the nut.

I don't see why the car needs to be back on the ground. The lower control arm "rotates" on the spindle,
so I don't see what difference it makes.

Now, I have a polyurethane LCA bushing. Maybe it makes a difference if you have the OE rubber bushing ?

[Dakota]

As I understand it, the lower control arm spindle will rotate on the bushing when the spindle nut is loose.  If the nut is tightened when the wheels are off the ground, the LCA spindle doesn't rotate freely in the bushing and the the bushing has to absorb most of the twisting, which effectively preloads the bushing in one direction of rotation.  The bushings would be more likely to fail over time.   

[anlauto]

  and you should have your ride height set where you want it, before tightening the nut. Any adjustments done to the torsion bars should be done with that nut loose

[dodj]

Doesn't matter with poly.

[jimynick]

I'm trying to figure out what spindle you're talking about. The only spindle in the frt end of these cars is the one the wheel bearings slide over and that you put your big castellated nut onto. 

[dodj]

There is also one the whole front half of the car is sort of suspended from.

[anlauto]

I'm trying to figure out what spindle you're talking about. The only spindle in the frt end of these cars is the one the wheel bearings slide over and that you put your big castellated nut onto. 

He's talking about the lower control arm shafts.

[jimynick]

In the interest of being fair and actual, I dug out my FSM and the lower "spindle"  is referred to as the "lower control arm shaft" and to be fair all 'round, they refer to what I call the spindle as a "knuckle", kinda like my head.