Power steering gear box

[Mad gimp]

Just a quick question concerning power steering gear box on my C30 dually. Will the steering box from like a C20 or even C10 interchange? For instance will a box of a 1/2 ton bolt on and work correctly on my dually? All i find on the internet is conflicting info.

 

[disenough]

I used a box from a K5 just switched the output shaft. The c30 drove the same and the box's looked the same inside and out.

 

[75gmck25]

I think the boxes cross between 1/2, 3/4 and 1 ton without any issue if it's the same year group (IIRC, 73-78 shaft ends are different than 79 and up) and the same drive (2WD vs 4 WD).

 

[RanchWelder]

Good advice 75gmck25.

Same same or it might not work, 4wd vs 2wd of any of the older pre-90's model years.
The Pittman arms can vary as well, so do your research at Rock Auto before you buy.

Off Road Designs sells the best of the best USA replacements.

In this day and age, you might have to bite the bullet and order a quality unit to get a good replacement that will last a few years.

Man I'm sad to write that.

 

[GTX63]

Correct 4wd and 2wd gearboxs differ, and the fitting for your power steering lines may vary.

 

[RanchWelder]

Yah, you might have to buy adapters and switch the lines with custom fittings.

Swapped the power steering unit to use a 1981 Camero small block pump mount on my 1994 block with Vortec heads with headers.

Had to switch the tank screw line fittings pump side, to continue to use the metric o-ring OEM lines on my steering gear.
The old school 1981 P/S unit which clocked a bit towards the water neck, was what would fit with a custom 1/4 fab plate to the head.

I found a couple donor P/S units and when I re-sealed & re-bushed a known good 1981 Camero pump, the internal threads from my 1987 and 1999 GM pumps, did match, despite the external fittings going to metric o-rings.

YMMV

 

[trucknorris78]

I could use some help on this as well. I got new, "factory lines". Here are the ports on the remanned gear box I got. They thread up but, it's like the threads on the pressure line are too short. I run out of threads, and the steel line can still swivel. The lines are 5/8" and 11/16". O-ring adapters appear to be 16mm and 18mm. As I mentioned, these lines DO thread into the gear box. As usual, I am lost!

 

[xm20k]

I could use some help on this as well. I got new, "factory lines". Here are the ports on the remanned gear box I got. They thread up but, it's like the threads on the pressure line are too short. I run out of threads, and the steel line can still swivel. The lines are 5/8" and 11/16". O-ring adapters appear to be 16mm and 18mm. As I mentioned, these lines DO thread into the gear box. As usual, I am lost!

Inverted flare adaptors they fit with the strait wall section down into the smaller diameter section with the domed side up and the flared section of line seals over the domed side. A few of the aftermarket boxes come with them that way they fit more vehicles. Without them you use o ring lines with you use inverted flair, this way it doesn't matter which you have you could use either.

Pardon Our Interruption

 

[fast 99]

Bought a Red Head box a couple months ago for a K20. Steering is much improved. Look at the website they explain what they do inside and why old boxes need rebuilding. All the shops I worked at only install their box.

Red-Head Steering Gears

redheadsteeringgears.com

 

[Ricko1966]

I could use some help on this as well. I got new, "factory lines". Here are the ports on the remanned gear box I got. They thread up but, it's like the threads on the pressure line are too short. I run out of threads, and the steel line can still swivel. The lines are 5/8" and 11/16". O-ring adapters appear to be 16mm and 18mm. As I mentioned, these lines DO thread into the gear box. As usual, I am lost!

One is metric one is standard,but they are so close they actually do thread in and @xm20k has told you exactly right you will need seats to convert to flare or newer hoses.

 

[trucknorris78]

I have seen those fittings, just wasn't sure. Thanks a lot fellas! I'd be in bad shape without people like you!