actually its funny you ask this. 2 weeks ago when I was doing my lift my helper was aguy with a 2dr RUBI JK and he had his stock springs and his 4dr rubi JK springs that he used when he added his winch to the stock jeep. anywho
we were curious if this would be a good cheap mod for other XJ's and we laid my stock Xj coils and the stock JK rubi coils side by side. they were almost identical both in length, coil thickness, and coil spacing. with this said I highly doubt it would provide any lit over a stock XJ coil. if anything it would only be because its fairly new springs as opposed to well worn 100k mile springs.
since your asking about ZJ's I would say you may even end up LOWERING your ZJ by adding rubi springs
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