Depends on whether you do the work or have someone else do it, depends on how hard you search for a tranny, and whether you install it yourself, it can cost anywhere from say 500 dollars to 5k, depending on how hard you search, your luck, if you are willing to not only pull the tranny from another car but install it in yours, or pay a shade tree mechanic to do it
The soft top doesn't bother me, it's the same one used on my 280sl and that wasn't too expense to replace. If it goes like my 83, the front end will be shot, the rear end will need to be rebuilt, the motor will be fine and the exhaust will be rotted out, seems to be pretty standard work required on 107 refugees. The tranny would be a new adventure. I know that the suspension work will run me about 5 grand to get it done right, and the exhaust about a thousand to do in stainless, the top about $400, so I'm looking at $8400 before I even touch the tranny if I want to put it into the same shape as my 280. He doesn't say if it is a standard or automatic, I called the guy, he didn't answer, got his vm.Purchase price $3000 tranny $2000 sound good eh? and soft top $? need I go on.
You missed out on a small bunch of items not least of which is to unbolt the torque convertor.Get it!
If you bring a along a Fatah Fist thingy from your precious inventory, I will show you how to handle a trans.
remove the top bolts
lift the car up and remove the drive shaft at the trans
Remove the trans mount
brace the trans with a jack then remove the remaining bolts, voila, just drop it like it's hot!
2 hour job!