I just did the conversion on mine. I used the Metal Tech conversion
https://www.metaltech4x4.com/metal-tech-gx470-rear-coil-conversion-kit-stage-1/
I then bought some Factory FJ Cruiser rear coils and it gave me a slight bit over stock rake (I think 1/2"). You might need to get the upper...
I just did the conversion on mine. I used the Metal Tech conversion
https://www.metaltech4x4.com/metal-tech-gx470-rear-coil-conversion-kit-stage-1/
I then bought some Factory FJ Cruiser rear coils and it gave me a slight bit over stock rake (I think 1/2"). You might need to get the upper...
I have a 2004 and have been running the 87 since I got it (2.5 months ago). I have been having slight hiccups during heavy acceleration. I switched to 91 to compare in my ride and it has eliminated that hiccup (could be coincidence but it is noticeable). I don't see any difference anywhere else...