489 Crush sleeve or Eliminator

The last crush sleeve I tried to use was for a customer and his 489 housing. He provided all the parts to install a 4.10 gear set. I tried to set the pinion bearing preload, had the pinion nut torqued to over 450 ft. lbs. and still had free play. Ended up pulling the threads out of the pinion nut. So I purchased a solid spacer with shims and set up the rear. I have made my own solid spacers for other rears I have set up, and never had any issues