Today i jacked up my jeep to check my front end for my vibration problems, shaking the tires, tugging and pulling on everything in the front end, nothing loose, so i figure maybe i lost some weights and need tires balanced, anyways i decide to mark and spin the tire and mark the driveshaft to see for sure what gear ratio im running, so 1 full turn of the tire = 1 and about 3/4 turn of the drive shaft, 3.55 is stock ratio so am i doing something wrong here?    

You are almost there... Take drive shaft revs times 2 when you spin one wheel and other is stationary. (spider gears double the speed of drive shaft and why you have to 2x it)  

thanks snoman, worked out to be 3.55, im going 4.56.