Just got the new Mopar Muscle, there's an article in there about Passon's new 5-speed overdrive direct replacement for the 833. It's a bolt in replacement but you do need an 18-spline clutch. No moving the shifter or changing the driveshaft crossmember etc from stock locations. I've been waiting for this one for a long time. Time to finally convert the GTX to 4-speed with overdrive!!!! Thanks Jamie!