Every day I come down a steep hill and have to almost stop for a very big speed bump. After I clear the bump and try to accelerate (still going down hill), the engine just revs like it's in netural. I let it coast down hill for 10-20 feet and then it's fine. (Stock Transmission)

Any Ideas??

The Allison will be "sluggish" in some situations in changing from coast to drive. Maybe you should punch up Tow/Haul to help decelerate for the speed bump (I do it all the time to assist braking coming off exit ramps and such, even unloaded) and leave it there until you begin to reaccelerate?