Ok, searched and couldn't find much....I have a full tube buggy weighing approx. 3500 lbs. Running 5.3 gm,th400,atlas 2spd...originally had built dana 300. I broke the back of a th400 at first, replace it with a beefed up th400 case, heli-coiled rear holes, and studs instead of bolts. Then broke adapter between trans. And t-case. Stock aluminum style (th400 to np203, I think ??) Then replaced with stock cast iron adapter and cracked it...now I do beat this thing, but some guys run twice the hp I do with this combo, so who makes the strongest adapter for this set up?