the rear toe adjustment is in the link I posted below.
a BIG concern with rear tire wear (or any wear for that matter front or rear) is the amount of weight in the the car if you NORMALLY carry a bit of weight *more than 50 pounds or so) it's a very good idea to have an alignment performed WITH THAT WEIGHT in the car as with any car the weight of the drivers and passengers make a difference in the alignment angles the factory sets the alignment with just a driver in the car and this is fine for NORMAL driving conditions BUT if you usually carry a full car load of people this can change the suspension height and therefore angles enough to cause abnormal tire wear.
also any worn parts or bent parts will cause the angles to become out of the specified range, the shop you have perform the alignment will be able to give you a full printout of the before and after readings anything WAY out of range needs repair anything JUST out of range is ok of course anything out of range should be adjusted IF there is an adjustment, adjustable angles on your car are front toe and rear toe if rear camber is out something is bent or worn, if FRONT camber is out a BIT there are kits available to correct this BUT require modification to the front struts, caster is a non tire wearing angle and NOT adjustable at all
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