Question...

[V6-Sauce]

A spoen rear sway bar, Will bolt right in place with the stock boxed lower control arms....would I be alright/any difference from the stock sway bar?

 

[1986 Buick GX1]

If the spohn swaybar your looking at bolts to the lower control arms like stock there will be a direct correlation according to bar size. The bigger the bar the stiffer it will be.

The preferred rear swaybar (before H&R) for drag racing was the ATR swaybar that bolted to the lower control arms that was 1 3/8".

Spohn make a pro-touring bar that mounts to the axle and frame that has (3) holes [I believe] for and aft to adjust the bar stiffness to match the front to dial in your oversteer/ understeer (prefer neutral steer for handling).

I hope that helped some.