Ok , I always thought the 518 was the same as 47RH. All of the rebuild instructions and even the FSM is very unclear about the models.
Anyhow, It's badass now LOL
Lose the 3200 spring. They drive a lot better with the 4200 spring. I just sold my 93 W250, made a little over 400whp with a VE pump and budget mods and turbo. Also had a built 518, it was a fun mid to high 14 truck