Using a Floor Jack as a Transmission Jack?

back when I was about 20, I was putting a(nother) trans in my 75 Cordoba.... at that time it was about a monthly thing. That was the car that I learned to rebuild a trans on....
Laying on my back, in my parents driveway under the car which was up on stands. I grabbed the bellhousing of the 727 and tried to roll it forward. there was a very sharp edge on that bellhousing. I think the jack hit a rock or fell in a hole but I wound up sliding the trans off the jack, and we all know how much leverage we all have laying on our back with arms extended over head. I wound up with a NASTY gash in my right hand just below the base of the pinky and next finger, a trip to the ER, 20 stiches later and it cost me a few weeks off my job I had at the time..... I had a He11 of a time getting that trans off of my hand.

an yeah back then I could bench press a 3 speed manual or A833 OD off my chest and pop it into the bellhousing but not any more. I could almost do the same w/a 904. Not quite. Definitely couldnt now a days.