"To a point I agree. I've been very happy with the 6-sp in our Cummins. However, my comment is more about "sales and marketing" than raw performance."
I agree most people "THINK" they need more gears. Gas pots and the V8 Diesels may find usefulness in the 8-10 but i can tell you another two or 4 gears won't make a hill of beans difference with the CUMMINS.
Bionic, you don't have the AISIN with it's very low starting gears. It truly makes a difference over the 68RFE especially with the 3.42's. When my truck downshifts it's a measly 250 rpm's between gears.
The AISIN is what they call a "Bullet proof" trans, I will stick with that.