Sold Out Quick view ATS Diesel ATS Diesel 2011-2014 GM 6.6L Duramax TCM Upgrade A50 to T87 - 6019404368 Compare $2,950.99 ATS Diesel 2011-2014 GM 6.6L Duramax TCM Upgrade A50 to T87 Currently Out of stock. On order! Currently Out of stock. On order!