I'm interested in installing an overdrive transmission in my 63 c10 such as a 700r4 or 2004r. I was basically wondering if theres anything specific i need to look for when looking for a rebuilt or used overdrive transmission for my application. Also, its going to be replacing the turbo 350 in the truck now. Would it be a straight up swap or would i need some new parts to install it? any help is appreciated. Thanks.