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The TKX and TKO have the same effective fifth gear OD ratio at 0.82 vs 0.81. Gear ratio-wise, the two transmissions are otherwise identical. The .01 difference in final overdrive ratios amounts to a 1% difference in engine rpm. At 2000 engine rpm that is 20 rpm. There is no measurable difference in the driving characteristics of either trans in one of our cars beyond shifting quality. The TKX synchros are what Tremec should have used in the TKOs years ago.
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Help them do what they would have done if they had known what they could do.
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