I am going transfer case hunting tomorrow and would like to know what I should look for. Searching on car-part.com for Bravada cases it asks for 3 1/2" or 4 1/2" output flange. Which one do I want, that is the same as the Sy/Ty?. Also, I was told that the Astro van cases are different in some way, possibly the output slip yoke being a different size or different spline, is this true? Should I avoid the Astros? Finaly, what is a reasonable price?