I'm currently building my '88 4runner and I used the chevy springs. Not sure how everyone else is doing it exactly, but I made a new front hanger and mounted it about 11" in front of the stock hanger. Then I moved my stock rear mount to approx 1/2" off the end of my frame. I did notice that the distance from the end of my frame to my stock mounts varied by about 1/4" , so I moved my mounts accordingly. Therefore, my actual overhang on each side is off by 1/4" but my shackles and springs are true. I still have to complete the job by boxing in the end of the frame and providing support for the mounts, which is going to be a crossmember of sorts. So I'd say the idea of making the mounts part of the bob crossmember may be a good idea. Also, I haven't driven it yet, so take the info for what it's worth, but I think it'll work out pretty well for me.
