Well i am dissapointed

[Mr Chevorlet]

The truck i thought was all done, well i drove it into town and noticed a whining noise from the rear axle, only when i let off the gas and coasting. There is no noise when i give it gas and underload. And from all that i have read so far it is possible the the pinion bearings bad. There is no slop in the pinion bearing when i pulled the drive shaft off. But there is about 1/2 rotation play between the tire and the pinion shaft when i have it jacked up and off the ground. Which is way to much.So the gap between the ring gear and pinion is too much right, what to do from here. It is a 12 bolt 3.08 open rear axle, u-joints and outer bearing are new but i did not do any thing to the pinion or third member. Does anybody have any opinions. Thanks