I have TKX with 2.87 first and the .68 OD with 3.23 gears and I love it With the cam in my car which is Speed Pro CS1175R 224/234 @.050" HFT which is similar to the summit 2802 it cruises along at 70 mph right around 2000 rpm with no bucking or grunting power range is said to be 1600-5000 or so rpm perfect for what I'm doing. Bigger cam and these gears maybe not so friendly at this rpm/speed. The TKX is nice as said below very little is needed to install only a couple small cuts to make the shifter fit in the stock location on my 65 LeMans
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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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