ATS TCM Upgrade, A40 to T87, 2WD, 2009-2010 GM 6.6L Duramax ATS Diesel Performance custom tuning no damaging or modifying the

no damaging or modifying the interior

Works with factory air ride equipped trucks only

aluminum quick connect coupler

The lift block installs in place of the stock block and retains ride quality and load capacity

ATS TCM Upgrade, A40 to T87, 2WD, 2009-2010 GM 6.6L Duramax ATS Diesel Performance custom tuning no damaging or modifying theThe A50 TCM that is used to control the Allison 6 speed automatic transmission is the weak link of the Allison transmission. This is due to delicate thin wires inside the TCM that contact one another overtime and short out the entire module. In 2022, Allison sent out a letter (SIL 15 1K2K 22) announcing the discontinuation of support for the A50. This effectively left over 10,000 Duramax owners out of their trucks. Some of the warning signs of a