[AcampoDave]

Here's my 2 cents worth... I hate trying to remove and replace, those granny trannys with a jack and brute strength. So, I figured out a way to do it solo and not even break a sweat. Simply pull the floor hump and bolt a short chain to the top of the tranny where the cover attaches, remove the shifter, (you have to push down really hard on the collar where the stick goes into the hole and twist) then bring an engine hoist in thru the passenger door, unbolt the tranny from the bell housing, hook the chain and wiggle that beast out of there using the hoist to be the strongman. The hoist makes putting it back even easier. No four letter words required!
Edit: I just saw you have a 69 GMC and I'm not sure if the center hump is removable like on the earlier models.