The man said he had the 4bbl 273, 4 speed, Liberty Overdrive, coil-over shocks and this 8 3/4 rear. And Front & Rear sway bars. The O/D was divorced bolt on unit with a 'Overdrive' handle under the dash, he still had it and I'd have bought it if I had the money. I was a married E4 in the Army. It worked in all gears, even reverse.