Retard switch
My neighbor just bought a new 2013 Fleetwood Expedition 40X with a 360HP Cummings and Allison transmission on a Freightliner chassis. We were talking about the "Retard" button and he said the owners m...
Forum Discussion
I turn mine on ,leave trans in drive,it downshifts trans to slow down if rpms low enough to overspeed engine.Is not an exhaust brake or a jake brake,but they work great.My understanding is they use a combo of trans,engine,vgt turbo.
Turn it on and let ecm operate on its own.
Turn it on and let ecm operate on its own.
