>>>>8.8 is the answer. The 9er quit going in around 83-84 model years. Any 1/2 ton truck or Bronco since then and up to 96 got the 8.8. This was the only axle available until you could get the light duty 250 axle in the 97 and up F-150(think it is a 9.75). I don't know for sure if the 8.8 in the current F-150 is identical though. Hope this helps. Later.