[Andrew Rowe]

To get that preload on the Ford diffs, you may have to sometimes use a couple of thickness's of gaskets. It all depends on whether you are using new bearings, or re setting with old serviceable bearings, and also the condition of your housing. So there is no true rule as to the thickness you end up using, other than the sizes given are a good starting point for testing your preload. Also to check preload, do so with pinion out, just my experience.