Power steering box interchange ...

[brimac50]

I might be  replacing a sloppy power steering box, on my 1980 3/4T, 2wd.  What newer year boxes , are a direct bolt-in replacement?

Thanks

[Captkaos]

Generally speaking 1973-80 for standard.  1981-87 for metric. 

[brimac50]

Do all those years have the same diameter and spline count, on the steering column shaft, or .......  are there some variations?   Also, are all power steering box shafts,  (to rag-joint) , the same?

[Tater502]

I put the steering box of a 90 4x4 blazer on my 79 4x4 gmc. The only difference is the hose fittings that go into the box.

[snibook7537]

I am pretty sure there is a difference between 4x2 and 4x4

[beastie_3]

I am pretty sure there is a difference between 4x2 and 4x4

Correct

[1979C20]

I put the power steering box from an 86 4wd burban on my 79 c20. Direct bolt up. Only thing I can tell that is different is the pitman arm I believe. And it makes my trucks turning much more reactive to the wheel and its misaligned slightly to the left, so my wheel is about a 16th turn to the right to go straight. Only thing I can tell. But, the powersteering box may have been replace with a 2wd one on the burban before I got it, I wouldn't know.