Dave, while the T50 box is strong the stock ratios still suck. I've been beating up all the options to get a sturdy box with decent ratios that won't cost $2500-$3000........or more.
If I could find the cluster gears for the close ratio 4 speed II have enough parts to build 2 ultra close and one mid close 56 series box................I'd be set for the next 15 years.