HD Torsion Bars: Independent4x.com

[Ldub]

FWIW...

The approximate change in spring rate sounds significant to me.

A full turn on the adjustment nut with stock bars = about 1/4" of lift VS
1/2 turn with the HD bars = about 3/8", which should be about 3/4" at a full turn...

By way of the limited comparative info, that sounds like close to 3 times the torsional resistance.

When linked to an equally resistant "spring", by way of the SFIFS...

[Marlin]

FWIW...

The approximate change in spring rate sounds significant to me.

A full turn on the adjustment nut with stock bars = about 1/4" of lift VS
1/2 turn with the HD bars = about 3/8", which should be about 3/4" at a full turn...

By way of the limited comparative info, that sounds like close to 3 times the torsional resistance.

When linked to an equally resistant "spring", by way of the SFIFS...

That would seem to make it more stable as well. I dunno. There is a...gulp...Jeep dealership here in my area that has a club and they have ramps they use for owners to test flex and whatnot. It may be worth a trip for me just to make them look silly as well as gather some tangible empirical data.

[Marlin]

In relation to the change in height vs the turns on the adjuster. The adjusting bolt is a 1.25.inch bolt. Thr stock one was 22 or 24 mm iirc. I don't know if we can really compare the two as far as rate of change.

[Ldub]

In relation to the change in height vs the turns on the adjuster. The adjusting bolt is a 1.25.inch bolt. Thr stock one was 22 or 24 mm iirc. I don't know if we can really compare the two as far as rate of change.

That'd depend on pitch (TPI)

[Marlin]

That'd depend on pitch (TPI)

Also true, but the way it adjusts is completely different than the factory setup. The adjusting bolt on the SFIFS is a direct connection meaning it is perpendicular to the torsion bar coupling. There are no angles involved so I think the actual distance the torsion bar is moved per thread is higher than with the OEM setup. It is also a gigantic PITA since it is adjusted with a wrench vice a socket. 1/16-1/8" of a turn at a time. A 2" body lift would help a lot
I didn't do any comparisons with the OEM bars. I know that my passenger side bar was way "looser" than the driver's side. Seemed odd to me and I cannot fathom why, but it was what it was.