I have seen several threads that say Downey springs will correct the rear end sag on a 2nd gen t4r...sounds good to me!
The problem is I can't figure out where to buy them?!?!? Does anyone know where I can get them? :shrug:
Rear end sag is due to worn out springs, so any new spring will return it to stock height, or higher if the new springs are lift springs.
As for Downey, they are out of business.
Old Man Emu is a better choice, their suspension systems will make a vehicle ride and handle better than new.