oh one more thing do not ever try this with an SM465 and a NP205 
when i was 17 i had a 3/4 ton 1980 chevy, and did just what you said, only without the plywood, rolled under on the creeper, held it up brother pulled the crossmember out, i pushed up and back , let it down on my chest and rolled out with it all laying on my chest and stomach, but when i rolled it off me, the tranny pinned my right hand, still got a nice scar over that knuckle
but then maybe thats why im like i am now
