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Best Price ATS TCM Upgrade, A40 / A50 to T87A, Early 2015 GM 6.6L Duramax
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Best Price ATS TCM Upgrade, A40 / A50 to T87A, Early 2015 GM 6.6L Duramax

Original price was: $2,950.00.Current price is: $1,180.00.

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SKU: SK0723130-US20251229-085220 Category: Tag:
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ATS TCM Upgrade, A40 / A50 to T87A. Fitment: 2011- Early 2015 GM 6.6L Duramax. The A40 and 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 and A40. This effectively left over 10,000 Duramax owners out of their truck

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