Brett , tipping the t case up was recommended by tom woods in hope to bring the angle closer to 90° instead of at a positive angle / .
Mongo , with +3°of caster it drives just fine. With 0° its very much on edge , tends to follow road imperfections and does not track straight .
Well I guess I don't understand what's going on here...... between raised TC and additional radius arm axle mounts you're pretty far from a stock setup and it may difficult to ascertain what the root of your problem is at this point.
But as Kyle and Frank mentioned with your lift a DC shaft(stock or TW) should suffice without much modification.
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