The 2wd brackets will bolt on, it just depends on your type of shocks that will determine how much needs to get changed.
The 2wd brackets use the same shock mounts as the 83 trucks, but I think in 84 they changed to a larger shock mount.
Other than that, I don't think there's much different.
The 2wd plates are already setup to clamp the spring to the axle.
Todd

1986 Pickup extracab longbed "Woody edition"
SAS - 33's, 5.29's, lockright rear.

02 IS300 SportCross - my "DD"
94 2wd v6 extracab
04 Outback Wagon- wife's/family car