What choose a reverse valve body?

AND NOW yet another annoying story from the old days

My first "mine" car (in high school had been somewhat driving Dad's "work" car, a 55 Chev stick waggon with a 5 hole 235)

So my first "mine" was a 57 Chev Moredoor 210, 265 2bbl and cast iron Powerglide. I had to look this up evidently the pattern was PNDLR, and the SHIFTER was a CONVERTED 3 speed on the column stick, so there were NO detents. This so called friend of mine was driving, and on the "pretence" of "finding more gears" he must have put the damn thing into reverse at least 3 times in about 10 seconds at about 40 MPH with me over there yelling at the top of my lungs and trying to get my hands on the key.

DAMN I WAS MAD!!!!

By the way that PG in all it's "cast iron-ness" lasted just about part of 1 whole summer. In went a 3 speed with a Hurst "misery shifter"
Yep, the old iron glides were PNDLR. If you wanted to force a downshift you tapped the lever down. If you pulled on it while yanking down, you get reverse.... at about 40 miles an hour. Im not sure how often i did it. Over or under five?