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2wd steering box- what years work?

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Mudstud

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Going cross over. What year 2 wd steering boxes will work- 73 to 87 or can it be a later model?:confused:

Thanks, Dan
 
Early to 76 (large SAE flare), 77 - 79 (small SAE flare), 80 - up (metric O - ring). What year do you have? You can swap the sector shaft into yours, or you can get a 2wd box that is in your year range so the lines will match up for the easiest swap.

I had an old 2wd box that I didn't know anything about, so just to play it safe, for my 89 K5, I just bought a refurbed one from the auto parts that was for a 89 1/2 ton 2wd suburban, and used my old one for a core.
 
On a related note, would a 3/4 or 1-ton box be any stronger or are they all the same?
 
txfiremank5 said:
Early to 76 (large SAE flare), 77 - 79 (small SAE flare), 80 - up (metric O - ring). What year do you have? You can swap the sector shaft into yours, or you can get a 2wd box that is in your year range so the lines will match up for the easiest swap.

I had an old 2wd box that I didn't know anything about, so just to play it safe, for my 89 K5, I just bought a refurbed one from the auto parts that was for a 89 1/2 ton 2wd suburban, and used my old one for a core.
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What he said.
 
goldwing2000 said:
On a related note, would a 3/4 or 1-ton box be any stronger or are they all the same?
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2WD comes in two variation: C10/20 for Chevy and C15/25 for GMC. Boxes are the same.

Manny
 
MuddinManny said:
2WD comes in two variation: C10/20 for Chevy and C15/25 for GMC. Boxes are the same.

Manny
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What about C30/35?
 
Hmmm, my truck is a 76 K5. What is SAE flare? Whichflare is more desirable?Not interested in swapping sector shafts. I figured I try and land a newer box since it prolly is made with better components and seals. One place I found says 68 - 91 will work. Whatever box I get I'll try and get the line with it.
 
FWIW if you have an older non-oring style pump (pre 1980 I would guess) you can simply change the fitting on the back of the pump with one wrench. I used a 1987 2wd box on my 1976 pump with a 1987 supply line.

Andy
 
goldwing2000 said:
What about C30/35?
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oops, look's like I forget one...stand by...

Checking with the online auto parts supply houses, the same part number carries through on C10-C30, so looks like they are all the same part.

Sorry 'bout that. Don't want to mislead anyone. My bad.

Manny
 
goldwing2000 said:
What about C30/35?
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I think GM used the same box in all 10,20,30/1500,2500,3500, the only difference being the 2wd & 4wd sector shafts. But, they should all be the Saginaw 708 box, at least I think so. I have no info to say otherwise. They used the 800 in the cars. Heres something I re-copied, on word, from an old Petersons.

BOX_CHART.sized.jpg
 
Like mentioned, there are all sorts of weays to make the box work.. either just changing shafts in your current box, etc etc.

I had a 2wd box given to me, but I, nor the guy who gave it me, knew anything about it. IE: was it worn out, was it good. Instead of going to all the trouble to put it in, and find out that it was worn, I just chose to replace it.

There are several good threads about it, so a search should turn up some good info on different ways guys have gone about making something work.
 
realsquash said:
FWIW if you have an older non-oring style pump (pre 1980 I would guess) you can simply change the fitting on the back of the pump with one wrench. I used a 1987 2wd box on my 1976 pump with a 1987 supply line.

Andy
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Not sure what you mean by this "you can simply change the fitting on the back of the pump with one wrench." Please splain :o
 
Thanks for all that info.

Mudstud: The pressure line threads into a fitting that threads into the rear of the pump housing. To change line styles, you can just change the fitting, instead of the whole pump.

The return line is just on with clamps.
 
Mudstud said:
Not sure what you mean by this "you can simply change the fitting on the back of the pump with one wrench." Please splain :o
Click to expand...

The back of the power steering pump, where the supply line to the steering box goes, you'll find a hex nut type thing (not ale!). You just remove that (clean all the gunk off around the pump first) and install one stolen from a newer pump. I recall that I got the fitting deal from a 1994 S10 pump. Very common part.

Andy
 
So you are basically saying the pump has a threaded hole in it then you put this newer adaptor in there and then thread the newer line into it. Right? I will borrow a few of these fittings next time I'm at the yard. Thanks man, that there is good info to know.
 
you sure can... thats what I did. Got a 91 box, lines, and fitting from the pump, swapped the fitting onto my old pump, both lines in, and the box.

I love my x-over steering. BEST mod yet, by far.
 
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