You're chances of finding a good used box are excellent. I've never bought a new one. I have had t swap out a worn out one, but easily found a good, used replacement.Sorry for the delayed response. Got logged out and didn't recieved notifications. No change between accel/decel. I have a low mileage box coming up from Nebraska from a good donor. Cheaper gamble than a $600-$900 new box. We'll see if it makes a difference
Glad to see you get back to this.