No they will not work. You either have to find different trac-locs for 4.09 and lower(numerically higher) gears or swap out the 4.09 gears that you currently have with whats called a thick version(has a thicker ring gear to make up the difference). Personally I wouldn't waste a dime on installing any used or new trac-loc. There's a reason why they are known in the industry as a "trash-loc" or "crack-loc".