Replacing steering box, anyone know what year range will fit?

[72timemachine]

Any help is greatly appreciated in trying to figure out what years may possibly work on my 84 1 ton dually diesel GMC.

The original owner I bought it from had to replace the engine due to his friend winding out the engine. Odometer broke a while back and he feels the chassis and steering box have 300,000 highway miles on it as he was a salesman using the truck to transport what he sold. The body is straight and was well cared for so I bought it after he retired.

I know nothing about the wear and tear of a steering box but I know they can get a bit loose and sloppy and you can adjust some of the slack out of them but mine is also leaking around the shaft seal below the rag joint so I would rather get one out of the boneyard (I can get one very cheap) with less miles and reseal it before installing it.

I know GM allows us to use the same parts on different year cars and trucks so do any of you know what if any later year trucks I could use to replace mine? It uses the hydro boost system to help apply the brakes but my truck really do not want to stop so I just keep extra underwear in the truck.

Again thanks for any help.