[bhap]

2WD and 4x4 steering boxes are the same with the exception of the sector shaft. I had a 1978 K10 box rebuilt and the builder swapped in a 2wd shaft. Later boxes have a variable ratio box but somewhere around 1980 they went to an o-ring fitting instead of the flare. You can swap fitting and get adapters, but it is easiest to buy similar year steering boxes and pumps so you can use stock hoses.