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Gm a body Jeep steering box swap

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  • Gm a body Jeep steering box swap

    so as an update I got the head back from the shop and that痴 back on the block waiting for a torque wrench. I知 currently saving up for body bushings and possibly air bags. In the meantime I swapped a Jeep Cherokee box with the stock a body box for the improved steering.

    when you put the adapters from the kit in the Jeep box will the old power steering hoses thread right in?

    I知 talking about the lee kit a lot of people use for this swap. (Ragjoint and adapters with a punch to install the adapters)

    So so far the box and linkage went in without too much issue..... just have to tighten some bolts and install hoses.

    also have any of you gents done this swap? Is it worth the hassle?

  • #2

    Re: Gm a body Jeep steering box swap

    This is really a thing? I thought Jeeps had some of the worst steering in the industry.

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    • #3

      Re: Gm a body Jeep steering box swap

      It seems to me that the GM Saginaw steering boxes such as used across their product line from the sixties on just got better every few years, by the time they were supplying on Jeep Cherokees they were really very good. It will be up to you whether you like the ratio but I'd bet you will, it will likely be a little faster than your stock box but not too fast. I'm sure that whatever Lee is selling is OK stuff, but as far as the fittings go you'll just have to try it. Lots of info on the swap via internet.
      ...

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      • #4

        Re: Gm a body Jeep steering box swap

        it's all the same think, the Jeep box is popular because there's billions of them out there - but its genesis is the quicker ratio boxes. It's why I grabbed the steering box off the GNX that donated its motor for my wagon. I still have no plans of putting power steering in it, but that box is more valuable then the motor and trans.

        Jeep steering boxes are fine because they were outsourced from a good company, it's the crap that Jeep designed that isn't... and to answer the question

        it's a metric box so you need adapters - otherwise it will leak
        Last edited by SuperBuickGuy; March 5th, 2019, 09:53 AM.
        Doing it all wrong since 1966

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        • #5

          Re: Gm a body Jeep steering box swap

          You'll have to find out what type fittings the jeep box what model and year fittings it used. and what fittings gm used on the g body.
          Many use the mid 90's JEEP grand cherroke steering shaft that is a solid part with no rag joint. Many also use the astro van shaft and do a little mod to them.
          I have the Astro shaft for my g body, but I'm questioning if it is such a good idea.
          The g body frame as it comes from g.m. new is weak and flexes ALOT , . don't think so, jack up the car under the engine crossmember, and then put it on jackstands on the fram under the a pillar/cowl and watch the weight of the engine make the front droop.
          A solid shaft, works great on the unitbody jeep as the box and steering column is both mounted to the unit body.
          The g body the box is mounted to the frame and the column to the body that is on bushings. that will give some, but the frame flexing will be putting lateral forces on the bearings in the box. as that solid shaft has no give like the rag joint did.
          I'm questioning using mine as This might be one of those mods. those that are autocrossing the cars do that makes the steering feedback much better as the cost of trashing the box and column bearings, or it'll just break the melted plastic pins that hold the collapsing shaft in column to allow it to move in and out. some.
          I have not looked deep enough into this yet as the parts are sitting on a shelf. along with the drop spindles and springs and such.
          The astro frame doesn't flex as much as the g body. . it is kinda scary how weak the g body frames are.
          An easy way to tell what fittings go into the box is, find out what year jeep and model cherrokke or grand cherroke.box you have and take your high pressure line from the g body with you to a parts store that has the jeeps h/p line in stock and compare them.
          Last edited by JamesMayberryIII; March 8th, 2019, 10:45 AM.

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          • #6

            Re: Gm a body Jeep steering box swap

            I threaded the hoses into the box last night and they seam to fit but time will tell

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            • #7

              Re: Gm a body Jeep steering box swap

              Saginaw went from flare to o-ring to metric o-ring. you have options to make it work - from adapters for the box to adapters that screw into the pump - it really depends on what line you use....I think you'll probably need one of these https://www.speedwaymotors.com/Steel...-GM,37140.html



              Obviously, the non-pressure side doesn't matter.... so just one adapter. It gets confusing when you add hydroboost.
              Doing it all wrong since 1966

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              • #8

                Re: Gm a body Jeep steering box swap

                How does that fitting work when the hoses are male and the box is female?

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                • #9

                  Re: Gm a body Jeep steering box swap

                  How does that fitting work when the hoses are male and the box is female?
                  There is a female/male adapter - that one illustrates the difference between the two fittings.

                  Of course, in this day and age - you can buy a hose that is old GM on one end and new "GM" on the other.... or get a braided one, and the list goes on of the possibilities.... but again, my point was to illustrate the difference between the o-ring and compression fitting.
                  Last edited by SuperBuickGuy; March 8th, 2019, 10:30 PM.
                  Doing it all wrong since 1966

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                  • #10

                    Re: Gm a body Jeep steering box swap

                    I see. I知 going to need new hoses soon anyway. These are at least 20 years old. I dunno if hoses could last fifty years.
                    SuperBuickGuy likes this.

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                    • #11

                      Re: Gm a body Jeep steering box swap

                      Got the box in and all hooked up. Ran the car for a bit and turned the wheel back and forth trying to cycle some fluid through the box. Not impressed yet but I値l judge it after I get out on the road.
                      Is there something I can run through my ps system to clean it?
                      Looked like water or rust might have made its way into my box

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                      • #12

                        Re: Gm a body Jeep steering box swap

                        about the only thing I could think of to clean it would be run ATF through it and flush it (don't hook the return hose back to the pump but rather to a bucket).... to be the most effective, you'd probably want to warm up the box then flush.... that said, I'd be more concerned with the pump getting trash in it
                        Doing it all wrong since 1966

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                        • #13

                          Re: Gm a body Jeep steering box swap

                          I値l be sure to run some atf through that ps pump and box. Thank you for the tip

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                          • #14

                            Re: Gm a body Jeep steering box swap

                            So I drove the car around the block a few days ago. The steering was better than stock but a little twitchy. I do need some new hose and some adapters because fluid leaks from the fitting at the gearbox and possibly from a puncture in the hose. Parked the car to find a pool of hy fluid on the floor next day

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                            • #15

                              Re: Gm a body Jeep steering box swap

                              Would be nice to have someone move the steering wheel while you are looking for the leak.

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