Markbe, another fix for this if you don’t want the oily dripping going on,is to jack up your Taco from the frame so the weight is off the rear axle. Depending on the ground clearance of your truck you may have to do some modified jacking to get it off the ground so the weight is totally off the leaf springs, next , if you have an old rubber inner tube, cut 2 or 3 small squares of the rubber to go in between each leaf spring. A small thin pry bar is essential to pry the springs apart enough to slide the rubber squares in so as to stop the leaf springs from touching each other.Over time you may have to replace the rubber but its more of a long term fix and not near as messy as the oils, Good Luck