ATS TCM Upgrade, A50 To T87 4-Wheel Drive For 2015 GM 6.6L Duramax transmission When you increase boost without

When you increase boost without increasing rpms or drive pressure

O-Ring seal to seal CCV Can to Tappet Cover and 4 stainless socket head bolts to attach the CCV Can

or straight out the back under the rear bumper for a muscular look

and longer U-bolts for a level stance

ATS TCM Upgrade, A50 To T87 4-Wheel Drive For 2015 GM 6.6L Duramax transmission When you increase boost withoutThe A50 and T14 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 and T14 TCMs. This effectively left over 10,000 Duramax owners out of their trucks. Some of the