I've got a mild built 455 in the 400-420 hp range with a smaller cam HFT cam, I was going to get an auto gear 4 speed originally so when I did the 8.5" rear swap in my car went with a 3.42 gear, long story but the guy screwed up and it roached the gears, Different shop installed 3.23 as they were available quicker and I was tired of waiting and wasting the summer, well in the fall the TKX was released and I had to have one, I went with the .68 overdrive as the supplier I purchased from had more in stock at the time. The car runs and drives great with this combo no bucking at lower rpm in 5th cruises 65 at 1869 rpm with a 25.8" tire Had I known the TKX was coming out I would have gone 3.73 from the start and I'm considering a gear change now more so for the better acceleration from a stop, my buddy just went from 3.55 to 3.73 with a similar set up and swears by the 3.73
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65 LeMANS , SD performance 462ci Engine, Tremec TKX 5 speed with a 3.73 geared 8.5" 10 bolt
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