You guys need to brush up on your history a bit. The 8 3/4 was the first rear in the 5's...a mainstay in the Top Fuel cars right up to the early 70's. Keep in mind that spools didn't become popular until '72 or so, and up to that point it was pretty evenly split between open and sure grip diffs in the Fuelers. According to the spec sheet on Garlits first R/E car, it was rolling on 4:10 gears and stock Chrysler spiders.