JRscooby wrote:
The ring and pinion in the rearend not only change the speed/power of rotation, they also change the direction. And I'm not a engineer, but I have rebuilt rearends that have different ratios moving the same loads. A higher speed ratio puts a lot more side force on the bearings. (And most of the "Bang! truck won't go" failures happen in reverse. Turning backward, the shape of teeth adds to the force"
But we are still back to...if you are within ratings, you shouldn't expect "bang! truck won't go".
They already addressed durability when setting the ratings.