Sway is something I would like to eliminate too. I improved the handling on my 1992 G20 shorty somewhat by adding two extra leaves to each of the rear spring packs. Keep in mind that these vans have 2.25" wide leaves. Most other vehicles use 2.5" leaves, so you need to grind extra leaves to allow the u bolts to fit around them. A sway bar would help some but for the money you might be better off with stiffer tires. If you have the stock P225/70R15 tires, a lot of improvement can be made by switching to a higher load rated tire. Unfortunately, in the stock 15" size, there is not a lot of room for improvement. Most newer vans have 16" wheels and there are load range E tires for these. I am considering getting new 16" alum wheels and heavier tires. Although, I love the look of the BFG Radial T/A's in 255/70R15 that I have now. New wheels would be $400 instead of the $250 for the sway bar, but would drastically change the look of your van too. Of course you would have the price of tires also.
