I've gotten some out with a torch, and had to sawzall others out. They never come out without one of the two above options if they are original springs. The bolt gets rusted and seizes itself to the sleeve inside the spring bushing. You have to cut both ends of the bolt off to get the spring off, and then press/heat/beat the bushing out.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride