Originally Posted by Nimyad
ok your factory rears are 48" long and the center pin is different then you're factory front so it'll move your front axle 2 inches forward. therefore you need to modify your front driveshaft. you can use pretty much any rear spring you want in the rear with modification. the most popular is the chevy 63s then the f150 springs. but im sure you can use s10s if you want, just probably have to move both the shackle and the front spring mount.
the RUF will push your front axle forward, possibly requiring you to trim th front lip of the fender, new drive shaft and you will need a longer shackle for the longer spring.
the s-10 rears are too long to just bolt up. you will need to weld on new front hangers and shackle hangers. an easier setup is to use chevy 63's as they flex like mad and ride great. you will still need to relocate the front spring hanger but you can use the stock rear shackle mount if you put the chevy shackle flat against the frame and then use the toyota or a different shackle on that. though this setup can be unstable on heavy braking while downhill or offroad as it can 'unload' both shackles... that said it can be very helpful offroad for the added flex.