yep there is deffinately a difference! I got the leafs the other day... the stock leaf are two normal leafs and a third support leaf for extra weight... the drop leafs are the two normal leafs with a lower arch and no third support leaf... which means blocks will make the ride the same and you can still carry a load better drop leafs kill the load capacity but will make it ride more like a car not a truck, also the leafs are more stable and won't let the rear wander under hard acceleration and cornering. Besides blocks can and do break, just ask the guys on here, I have read about more than one set of cracked blocks even on an old like 73 with a whopping 89hp 18r or some really weak numbers like that... blocks suck you can have mine if ya want em, never installed! LOL! oh and BTW I got the chassis tech spindles coming... $189 shipped!! WHooHoo!! messaged the $205 guy on ebay when I noticed his prior sales showed he sold em for 189 back in Nov... so he gives me his number I called him... and their on their way!