When browsing all the sites for parts, you see so many different names. R10, R20. V20 V30, ect ect. All i want to know is what my truck is. It is just your typical '87 half ton Sliverado with a 5.7 liter. Automatic. I realize it would not be S10 or any of the obvious ones, but maybe someone here could line out which is which, and for what years?