Drilling Steering Gear Box for Hydro Assist? - JeepForum.com
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post #1 of 11 Old 06-10-2018, 05:31 PM Thread Starter
Line58
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Drilling Steering Gear Box for Hydro Assist?

I've seen a handful of threads that discuss drilling out the stock power steering gear box for hydro assist steering, and have yet to see anything about negative repercussions of doing this. Based on the fact that most people are willing to pay decent money for aftermarket gearboxes when they go to hydro assist, I assume there is a reason why you wouldn't/shouldn't simply adapt the existing gearbox. Is it smart or safe to use the stock gear box? Why or why not?



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post #2 of 11 Old 06-10-2018, 08:50 PM
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I was going to drill my OE box for hydro assist, even bought a NPT tap and AN fittings. But then Northridge had too good of a sale this past Black Friday to pass up. After installing a new gear box, I didn't know how worn my OE box was. I wouldn't say there is any disadvantage to doing it if the gear box is good and looking to save some money, unless you drill a hole in the wrong spot. But it seems just two different types of build styles, adapt to make it fit, and buy what fits. If you got the extra money, its defiantly nice just removing a part and reinstalling a new part ready to go.

But the OE power steering pump is still going to put out less PSI than what most places sell for hydro assist kits.

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post #3 of 11 Old 06-10-2018, 10:28 PM
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I tapped a Wagoneer box, and put ZJ guts into it, running a PSC ram. I tend to make a lot of my own stuff, and it works well for me. Im not spending $900 on a box Im going to put hydro assist on.

You will want to get a good pump though to keep up though. Stock pumps work but are quite a bit slower is all.

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Edit: I also MIG welded in the steel fittings after tapping.

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post #4 of 11 Old 06-11-2018, 07:38 AM
biffgnar
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I'll echo comments about pump speed. Even with the PSC pump sometimes at low RPMs when rapidly switching sides (e.g. parallel parking) I can feel the system lag a little. It's not bad and I doubt someone who wasn't thinking about it would notice so I can live with it, but at Blaine's suggestion I may try changing hose sizes. Just need to find the time.
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post #5 of 11 Old 06-11-2018, 08:38 AM
BigAl4102
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Quote:
Originally Posted by pcoplin View Post
I tapped a Wagoneer box, and put ZJ guts into it, running a PSC ram. I tend to make a lot of my own stuff, and it works well for me. Im not spending $900 on a box Im going to put hydro assist on.

You will want to get a good pump though to keep up though. Stock pumps work but are quite a bit slower is all.

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Edit: I also MIG welded in the steel fittings after tapping.
Why the ZJ guts Paul? That's one I had not heard of.

I suppose it's heavier duty like the tie rod and drag link?
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post #6 of 11 Old 06-11-2018, 09:59 AM
pcoplin
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Quote:
Originally Posted by BigAl4102 View Post
Why the ZJ guts Paul? That's one I had not heard of.

I suppose it's heavier duty like the tie rod and drag link?
Not heavier duty, but many are a faster ratio, a straight 12:1 versus variable like the TJ.

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post #7 of 11 Old 06-11-2018, 10:07 AM
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Quote:
Originally Posted by pcoplin View Post
I tapped a Wagoneer box...
What's the difference between the Wagoneer box and the TJ one, or was it just a matter of what was available?
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post #8 of 11 Old 06-11-2018, 10:12 AM
pcoplin
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Quote:
Originally Posted by JEK3 View Post
What's the difference between the Wagoneer box and the TJ one, or was it just a matter of what was available?
It's a 4 bolt box like the YJ. Back before I head Hydro assist I had that and it Currie brace. With Hydro assist it doesn't matter if you have three or four bolts because the load is lighter on the box mounts itself.

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post #9 of 11 Old 06-11-2018, 10:36 AM
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Quote:
Originally Posted by pcoplin View Post
It's a 4 bolt box like the YJ. Back before I head Hydro assist I had that and it Currie brace. With Hydro assist it doesn't matter if you have three or four bolts because the load is lighter on the box mounts itself.

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So you added a fourth mount sleeve?
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post #10 of 11 Old 06-11-2018, 10:43 AM
pcoplin
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Originally Posted by JEK3 View Post
So you added a fourth mount sleeve?
Yes, that would be required to utilize a fourth bolt hole.

I've done front framework and made sure to fabricate for a 4 bolt box when I did it.

I also have a tapped TJ box ad a spare should I break this one again.

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post #11 of 11 Old 06-11-2018, 10:54 AM
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Quote:
Originally Posted by pcoplin View Post
Yes, that would be required to utilize a fourth bolt hole.
You would think so, but people do crazy things...
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