In 1969 In my 64 Belvedere I had my 4 speed out at least 6-8 times. Same procedure each time, there was a small ditch in the back yard so the car straddled it, I would slide under car (very thin and tall 155 pounds) removed the trans, and other pieces, to lay it on my chest then roll over to get it out from under car. The only parts I didn’t replace was the case, tail housing and input shaft. A 23 spline so not to hard to get back in. Now I’d need 1 foot blocks under wheels for me to get even close.