Leaf Spring recall question

I have a 2009 Tacoma 4x4 regular cab. 4 cyl. Just had my leaf springs replaced at the dealership under the recall. My question is this: I had a 3 leaf pack on the vehicle and the dealership installed a 4 leaf pack. I picked the vehicle up at night so I haven't been able to really check it out. Seemed to ride ok. What is the difference between the 3 leaf and the 4 leaf and should this be anything to be concerned with? Thanks for the info.

 

It means you'll be able to haul what the truck is rated to haul.

 

4 leaf is the only springs put on tacomas since 2013 for sure maybe a year or2 before not sure.But had new frame on my 05 3 weeks ago and 4 leafs replaced my 3 leaf too.