Rear end location wrong? IM STUMPED!!!

I'm going to throw my hat into the green bearing ring for a moment.

7 1/4 use sealed ball bearings. And there were hundreds of thousands of not millions of them running for decades, not to mention the Ford 9".

Yes tapered bearings are more robust but if you have a bearing that will last 100,000 miles and tapered bearings will last 100,000 miles what different does it make.

I'm done.