What is the rear leaf spring tsb?

I keep hearing about this tsb on the rear leaf spring of the Tacoma's but I don't know what it is all about. What are the problems with the stock suspension and what do they do to fix it, and where do I go to get it fixed?

 

They upgrade to a 4 leaf pack instead of the shitty 3 leaf pack... The stock 3 leaf pack can't hold up a gumball from squatting the suspension. Constantly bottoming out the bump stops. You're probably too late to switch them out (for frree) since you are past your warranty (most likely)

 

I also have an 08 TRD, AC OR. Only 35k miles but beyond the age limit of three years. Took it to a Toyota dealership to confirm and price out the upgrade. Over $1800. which Toyota outright refused to do.

This fall I will be installing a Firestone Ride Rite package. Do a search and check these out. Seems to be a popular fix here if your existing leafs aren't broken.

 

Are these leaf packs fixed on the new Tacoma's or does my 2013 have crappy leaf packs too?

TSB for 2013, yay or nay?

 

Which configuration ?

PS , even the TSB 4 leaf pack sucks

 

here is your fix
http://www.tacomaworld.com/forum/suspension/194386-tacoma-spring-refurbishing.html

 

Figures!

I don't plan on hauling much but camping gear and a dog, and light towing 2-3 days a year maybe. But '13 DCSB PreRunner with 2.7 and SR5.

PS, thanks.