I am sorry I don't know how I missed this one for so long. The automatic transmission equipped vehicle will need to go with our exhaust brake part number 1027145AP. The AP is the code for our autoloc pressureloc control module. The transmission likes to keep the rpm fairly low so when you activate the brake we need to get it to downshift to bring the RPM back up to the point of having effective braking. Send me a PM for pricing.