"How it is geared" is referring to the rear end (rear axle) gear ratio. A smaller or less powerful engine can be regeared for better performance in certain situations.
I'd be willing to bet this is a standard e150 with a semi-float rear axle and 3:73 gearset, with the 4r75 tranny. I would think the van will do fine for camping duty with your family or four but it would be pretty weak for towing and it's not going to win any races.