Finally at the point where I can justify upgrading to an O/D trans. I've rebuilt or replaced everything mechanical on my car except the trans. Well that's not entirely true...I bought this TH350 about 7 years ago for $150 and it has been Rock Solid...still is. But I'm screaming down the hwy at 75 or 80 with my 3.42 gears. So I'm about to add an O/D transmission here pretty soon. Trying to determine the best route...order the trans and swap kit online or find a local used one and order a swap kit and have it built at a local transmission shop. Any benefit by doing it one way vs. the other? Would pulling a core save me any money??