Tire shop told me I need to look at my Ujoints. I started checking and I believe I have a couple that need to be replaced. I have no idea what I am looking for so here is a couple of ??? 1. Just how many u-joints do I have? 2 rear drive shaft 2 front drive shaft 2 on the D44 knuckles 2. are they all the same size? I thought about carrying a couple extra but does one size fit all? 3. I know the different sizes (1310, 1350, 1410, 1480) are thicker and stronger going up, but what size for the 3/4 ton burb. 4.Spicer Life U-joint's? ($24, $24, $29, $54) Good Deal? Some advise for the newbie?