da-kuk/E+ via Getty Images Allison Transmission Holdings, Inc. (NYSE:ALSN) recently published great Q2 earnings results on July, 25. Despite significant growth in their North American On-Highway, and Defense end markets, and a raised 2024 guidance, I am still not convinced of management's confidence in the current share price. Despite the repurchase of $31 million in shares during the second quarter, there was no insider buying activity. In other words, no skin in the game, which to me is an indication  ...