lowering rear end question

[69gmc292]

Hello,

I have done a spring over drop on my 69 gmc long bed over a year ago and i had a bad clunk when i would go from reverse to drive. After I jacked up the truck i noticed that the pinion was moving around in the housing. The rear end was not leaking and there was no metal bearing material in the gear oil. I was think about putting a new crush sleeve, input seal, and pinion nut on. I am thinking that this happened because of the new angle out the pinion after the drop. I am also running a drop carrier bearing too and my u joint angles are well with in spec of what I have read online. Have any one have had the same type of problem after they dropped there truck.

Thanks