Thanks for the input. So much info out there/on forum, its kind of confusing...Hoden
6112'S are a more robust unit 60mm shaft 2.6" shock body and they come with 600lb Eibach springs. you could also run 5100'S in the back and save some money.
5100"s will be very similar to the Bilsteins that were on your TT when you bought it but they are height adjustable. for what you are doing with your FJ the 5100's with new eibach springs would work very well. as far as the back goes i would just put new shocks 5100'S and try the stock spring. if you want to lift it then i would replace the rear springs.
the new springs in the front will help with the brake dive. i think they still make the 620lb for the 5100"s you can call Toy Tec and see what is available.