E body from 4 speed to 727 auto

[Meyer]

What will it involve?

[xx88man]

What will it involve?

IN MY OPINION..... trade the 4-speed car for an automatic instead

[CudaMoparRay]

Not answering your question but if it is a numbers matching car I would trade it for another, if it is not then I would change the manual to the automatic transmission. 

[cuda hunter]

You do not have to remove the 4speed hump from the floor. 
Different transmission mount
Different driveshaft.
You will need to add a tunnel automatic bracket and automatic shifter cable.
If you don't want a console you will need to change out the steering column.
remove the reverse light from the lower dash. 

Someone please correct me if I'm wrong. 

[cuda hunter]

A couple automatic bracket and shifter linkage pictures.  70 bh car.

[cuda hunter]

I"m not sure but I think you can just remove the pedal from this set up.

[cuda hunter]

remove the z bar and the z bar ball stud. 

[xx88man]

I"m not sure but I think you can just remove the pedal from this set up.

Or if you never plan on changing it back you could sell the 4-speed pedals. Guys are looking for them

[cuda hunter]

Picture of the 4 speed hump.

I would keep all the 4 speed parts and keep the hump on the floor for an easy re-conversion. 

[RUNCHARGER]

You will need the proper kickdown linkage, that will be the biggest PITA to find, then the shifter and linkage, then obviously a trans, convertor and flexplate. It should be really easy to find someone with an automatic in their car that would like to change to a 4 speed depending on where you live. I know I would jump at the chance if I had an automatic car. That way you would be sure of getting all the parts you need.

[cuda hunter]

https://bellingham.craigslist.org/pts/d/bellingham-dodge-challenger-parts/7180679846.html

A few parts you will need here. 

[Shoooter]

Where are you located? Lots of members would be interested in the old parts. You will need a different console as well

[jimynick]

Don't forget a new rad with a trans cooler in it, as well. And then there's the question- why? Your car and your call, just curious because there're many others, as mentioned, who're going the other way. For a serious buyer, it may also kill the deal, if he's a purist- and they're out there. Just my 

[cuda hunter]

slap stick set up.

https://seattle.craigslist.org/sno/pts/d/north-lakewood-mopar-slap-stick-setup/7170558107.html

[Shoooter]

700 American? Really. I'll sell a set up cheaper than that