unfortunately the 6.5 was not a real big engine for producing backpressure so the exhaust brake was limited on how well it would work then you add the auto trans without lock up and it made it worse. The only company I heard of that made an exhaust brake for the 6.5 chevy was BD, you can try...
Hello all I’m Harold-Pacbrake, First off I want to say I’m not really here to sell you anything, so please don’t think “great another vendor trying to peddle his stuff”. Our company directive is that I aid you all in technical information pertaining to engine/exhaust brakes, on-board air...