I found my problem!
I had the front dif tightened to allow very minimal dif action, esentually making it a dif. well I guess the lenght is affected by this because there is a slight side to side motion allowed to the dif from the bulkheads. this is why I was getting a rattleing noise. Duh!!! so lesson learned. if you want a spool get one or lock dif/oneway with jb weld.
By the way has anyone made a spool of a dif sucessfuly?