I have two cars with Lloyd Young Borg Warner Overdrive units, viz.: a 1933 Packard Super Eight Convertible Sedan (145PH & 4,930 Lbs.) coupled to a standard 4.41:1 rearend and a 1932 Cadillac V-8 All Weather Phaeton (115HP & 5,070 Lbs.) with a 4.60:1 rearend. Also in my garage is a 1933 Packard Twelve Convertible Sedan with a Phil Bray 4.06:1 rearend without overdrive. I have driven each vehicle at least 6,000 miles and up to 18,000 miles. The 1932 Cadillac needs the O/D the most as it has the least favorable weight to power ratio. It can now cruise at any reasonable speed desired without having to listen to the engine buzzing down the street. The 1934 Packard loafs along at 50, 60 or whatever speed you desire. Also, it can accelerate much quicker in O/D than the Cadillac. These two Full Classics I use for serious touring in excess of 1,000 miles at a time. The 1933 Packard can cruise at reasonable speeds without O/D and loses little, if any, acceleration with the slight numerical decrease in its rearend. As far as the O/D self destructing in reverse if not locked out, it can only be forced to self destruct if you ignore the vehicle's reluctance to move in reverse when the O/D is engaged. As to concours shows. I have never lost points because of an O/D. There are two reasons for this. First, the O/D in both cars is tastefully installed so that it looks as if it belongs and second, the judges don't realize that it doesn't belong to the car.