y is there a loud noise on decel after replacing r&p

What is your question?

Hello everyone im new here but need help.i replaced ring and pinioin bearings, worm gears and side bearings, had to replace drive shaft had aluminum now has steel, i replaced because of chipped pinion shaft teeth and bearing,now i have a lound whining noise on deceleration was not there before can some one tell me where i went wrong. or some suggestions. please