Is there a Crown steering box with 12.7:1 ratio? - JeepForum.com
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post #1 of 6 Old 03-16-2020, 04:48 AM Thread Starter
DW2296
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Is there a Crown steering box with 12.7:1 ratio?

I've found two different new (not re-manufactured) Crown boxes that seem to work for the ZJ, part numbers 52038002 and 52088386. Does anyone know if one of these is the 12.7:1 quick ratio, and if not is the 12.7 box even made anymore? I suspect that both are 14:1 ratios, and am really trying to find the 12.7:1 box. Thanks.

edit: I see a lot of conflicting info online on even what the stock ZJ box ratio is. Some say all ZJs were 12.7:1, some say that it's only the V8s, and others only the 96-98 V8s. There must be a lot of misinformation so it would be nice to clear this up.

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post #2 of 6 Old 03-16-2020, 10:28 AM
Timo_90xj
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I know for sure both my 1990 XJ steering boxes use different ratio than my ZJ box. I've seen it mentioned in many places that ZJs use 12.7 quick ratio boxes, but I've also seen mentions of variable ratio. Who knows for sure, unless one could find some sort of codes on the box that verify what ratio it is.

I can't say for 100% sure even though I've rebuilt both of my XJ boxes and my ZJ box Based on steering feel, my ZJ box is either a 12.7 ratio or some sort of variable ratio. XJ boxes installed in my ZJ felt noticeably slower.
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post #3 of 6 Old 03-16-2020, 08:46 PM Thread Starter
DW2296
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Interesting, does anyone who has one of the new Crown 52038002 boxes have anything to say about the ratio vs the original box?
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post #4 of 6 Old 03-16-2020, 11:36 PM
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I've got two crown boxes and they seem to be the factory quick ratio. I haven't actually checked though.


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post #5 of 6 Old 03-17-2020, 03:39 AM
Kolak
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The Crown 53088386 supersedes to the 52038002. As for the ratio, it should be 12.7 like the stock ZJ box. All ZJ boxes are 12.7. The XJ is 14:1. The Crown box fits the XJ as well but they went to the quicker ratio to standardize according the info I have.

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post #6 of 6 Old 03-18-2020, 04:52 PM Thread Starter
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I went ahead and got the Crown steering gear, part 52038002. I measured it and it is a 14:1 ratio. Also, as per Crown, the 52038002 and 52088386 are both 14:1 ratios, so it looks like I'm out of luck as far as getting a new 12.7:1 gear from them.

Now I'm trying to decide if it's worth it to use the new part with the slower turning ratio versus a used 12.7:1 one. There are certain internal parts such as the worm gear, piston, and sector shaft that do wear over time which I was hoping to resolve with a brand new part. Does anyone know if brand new replacement internals can be gotten for the 12.7:1 box? It seems like the Crown replacement internals are also 14:1 ratio parts. Other than that, I will probably try to find a low-mileage used unit and rebuild it.

On another note, browsing the factory part number sites gives 52088386 as the part number for the XJ steering gears, which came with 14:1 ratios. For the ZJ, the part number is 52088488. That seems to be the part number needed for the 12.7:1 gear.
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