zazoos,

the spinning blazer vs the non spinning ford is most likely due to differnt style differentials. like dssherrod said, your blazer probably had an open diff. the ford probably had what is called a limited slip diff. the easiest way to explain the difference is that on an open diff, if one tire loses traction, it is going to spin. period. and no power will be sent to the other wheel. a limited slip prevents that and tries to send power to the opposing wheel. limited slips are not perfect and the only way to ensure 100% that you are going to get even power to both wheels on an axle at all times is with a locking differential. like the name implies it locks the differential so that both wheels get power. limited slips are not bad and are much much better then open diffs. one of the options on the x is a limited slip diff. it isnt the greatest one ever made but it does the trick in most situations. hope this helps (but knowing me i probably made it worse).

get the X ... it rocks!