Just in case someone hadn't noticed it, there's a giant difference between the Jake Brake used on OTR Diesels and the exhaust brakes used on Diesel Pickups:
The OTR Jake works by changing the valve timing while the PU brake, essentially, acts like a potato in the tailpipe.
The biggest problem with putting an Exhaust Brake on a Diesel PU with an automatic transmission is, quite simply, the fact that the transmission wasn't designed to handle the stresses of trying to drive the engine that hard.
The Allison and the TorqShift are each supplied by a manufacturer who'd have a "perfect out" on any warranty repair to the tranny by simply pointing to the EB. The Dodge 48REs prior to the mid-year 2004 models likewise. (They started installing a redesigned $6 part that testing showed to fail and
may, eventually, certify the later-production units for EB use.)
For the Ford people, Western Diesel makes/made an electronic box that utilizes the warm-up butterfly valve as a Ford-approved EB for the 7.3L and, perhaps, the 6.0L engines.
FWIW, If you look at my sig, you'll see why I've been keeping up with the warranty issues (from D/C, at least).
