[Budweis]

if indeed you have a 70 with open knucles well i just went through this on a 70. the drums are definitely non existant for new ones and i searched for 5 years and only found 1 turnable used one. the good news is you can just pull the hubs and backing plates and knuckles off a 71-72 and swap right on. im not 100% sure but it looks to me like you could use existing knuckles if drilled one hole on each side and tapped for the dust shield as the flat spot for the hole is already there and when i compared knuckes and measured thats the only difference i could see. i had a whole 72 differential so i just swapped from the knucles out. heres a few pics.