being an 86, there's simply no way to know for sure. the ratios weren't really standardized until 87. plus all sorts of craziness can be swapped in over 30 years time.
easiest way is to check is to jack up one tire, put the trans in neutral, and rotate the tire around twice while counting the number of times the driveshaft rotates. for example, if the driveshaft rotates around about 3 and a half times then the ratio is 3.55. If for some reason the rear diff has a posi in it, then you'd have to jack up both rear tires and rotate them around just once.