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The thickest Ford swaybars came on Marauders and Crown Victoria Sports. Quite a bit thicker than the P71 Police parts I think. Also a quick ebay search shows plenty of aftermarket bars in various sizes larger than stock and in the $100-130 range.
As far as the effectiveness it all depends on the length of the lever arm, the material of the bar, and the geometry of the bar (length, diameter, tube vs solid etc). From a design standpoint the Ford bar has the advantages of not stressing the lower control arms and their bushings and mounting points. It only exerts vertical force on the axle tubes (which can take it) and vertical force through the end links into (a pretty beefy part of) the frame. The fact that those cheap hardware store 3/8ths inch probably grade 3 u-bolts have held up and not slipped at all is a pretty good testament to the fact that nothing is binding and its working as it should.
The best design is the bar that mounts in bearings mounted to the frame and has adjustable length lever arms going to endlinks that drop to the axle. Serious drag racers use those a lot. They have the additional advantages of adjustability, the ability to preload, and less unsprung weight. But for the B-body crowd in my opinion the Vic bar is as slick as it gets, especially for us wagon guys.
As far as the effectiveness it all depends on the length of the lever arm, the material of the bar, and the geometry of the bar (length, diameter, tube vs solid etc). From a design standpoint the Ford bar has the advantages of not stressing the lower control arms and their bushings and mounting points. It only exerts vertical force on the axle tubes (which can take it) and vertical force through the end links into (a pretty beefy part of) the frame. The fact that those cheap hardware store 3/8ths inch probably grade 3 u-bolts have held up and not slipped at all is a pretty good testament to the fact that nothing is binding and its working as it should.
The best design is the bar that mounts in bearings mounted to the frame and has adjustable length lever arms going to endlinks that drop to the axle. Serious drag racers use those a lot. They have the additional advantages of adjustability, the ability to preload, and less unsprung weight. But for the B-body crowd in my opinion the Vic bar is as slick as it gets, especially for us wagon guys.