This converter is for Th350, Th400 or even Powerglide transmission with turbo spline input shaft which most use. I ran 9.80's with it on my n20 setup, then sent it in to get freshened up costs $260 and they told me it was in perfect condition. Now I'm going to turbo and going to buy a PTC converter since they do great on those converters. This converter was $800+ new and I'll take $450+shipping. Lmk thanks