Shudder

My 02 Taurus has a shudder feel ONLY when I hit a dip or go over a small hump in the road. Just had new converter installed in transmission and fluid changed with additive, but there was no improvement. I notice it more when people are riding in the back seat due to extra weight in car. Hoping it's not the tranny. Car shifts perfectly.

Any ideas??

Could it possibly be CV joints? Anyone had any experience with those?

Thanks.