If youre at the point where you need to sleeve your 30 why not look into upgrading to dana 44's or tons? More to the point though. Why do you think you need sleeves? What size tires are you running? What kind of wheeling do you do? In all honesty the rear amc 20 is more likely to bend, spin a tube, spin a hub than bending the tubes on the 30. I ran stock axles under my 7 for a long time with 35x14.50's. When i changed over to dana 44's the 20 was bent like a smiley face and the 30 was straight. I did have a lot of trouble keeping axle shafts and gear sets together in the 30 though.