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I recently got up under the Ranchero (66) & measured my 8" rear end - backing plate to backing plate. I always thought that this was the correct way to measure a rear. Mine is 53 inches & I measured it twice. Once to measure it & a second time after I got on FM and researched rear end width & say that mine was roughly 4" shorter than the narrowest 9". The 57 to 59 Fairlane (or there abouts for you nit picks) is supposedly the narrowest 9" available. Are 8" rears that much narrower than 9", or am I measuring incorrectly?

Rick
 

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The 8" housing that came out of the Falcon was 54 1/2". Add 2 1/2" per side for brake offset at the axle and you get 59 1/2".
 
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