[Fat0eknee]

ford made the best rear end that ever was. even chevy guys envy the 9" rear end

..and to fix your problem i think summit sells rebuilt kits for a fair price along with various differentials you can buy - take those somewhere and have them put it in for you ...might as well upgrade the ring and pinion while they are at it

so what ..rebuild kit is 50-100 bucks
the ford differentials off summit range from 260-500
and ring and pinion will run you ... what 125-175
add labor and you are under 1k for a rebuild