Rear End Ratios

sorry im still really new to this (haha im only 17) and when i get it up on the jackstands only one wheel spins while i turn the driveshaft. so im not sure how im supposed to make sure both wheels turn if only 1 will.... (sry i know this is prolly a stupid question but i really dont know)

No problem. In a case like that it takes 2 people to make sure both turn a full turn. And it's not a stupid question. We all have to learn.

I see there are 3 responses to the question now (counting mine) and as I look at them close they accomplish the same thing. Just put in different terminology.