I have A Pacbrake and a DTT smart controller installed on my truck and love it. I do not have any transmission mods yet but will be doing vb/tc in the future . I think the Pacbrake for my truck was 735. 00 and installs in 2 hours and they are a ISO 9002 certified company ,and dont give you a bit of hassle about warranty. As a matter of fact I purchased a defective model ,called them right away and they didnt even ask any goofy questions nor did I have to send mine back first . They sent a new one Red label and asked me to call them after it was installed so they could get the old one picked up. FYI I am not a dealer for any of these products ,Just sharing my veiw on the good parts and good customer service I have received