Funny but I am just starting to build damned near the exact thing as you are. We are putting a 9" ford in the rear, mini t-case and a mini front axle. The truck will end up with 38" sx's though. Id say you'll have no issues at all with the t-case. I ran my 84 HARD with a th350 a very healthy 350 and a 21 spline mini case. Just do it you wont be disapointed.
