Purchased a thermal bypass valve for my dad's Cummins for Christmas. Turns out, he already has one. I've made multiple email attempts to contact this company for a return. No Response for a full week.

Run--don't walk--away from ATS Diesel Performance. This company has been nothing but a financial and mechanical disaster for me. After just 18 months, the first ATS Allison replacement transmission co

INCOMPETENT EMPLOYEES, LEMON TRANSMISSION & NO CUSTOMER SERVICE!!!!! READ THIS before considering a transmission from ATS! They took 7 months to get me a functioning transmission, sent me a lemon, tri