23 TRD Sport rear end lift

I have a 23 TRD Sport and was wanting to put a 1" lift on the rear using the block method to keep cost down. I have been told that the rear suspension is coil over shock and air suspension and the whole suspension would have to be replaced to do a lift which is more than I'm interested in spending. Can anyone verify this please?

 

The 3rd gen have a totally different rear suspension than the previous gen. On the previous gen you had lift blocks, lift shackles and lift springs. The new gen is a multi-link with springs. I would imagine that a lift springs will be available soon or they already have one. Do a search.