Quadratec replacement leafs: standard or medium duty? - Page 3 - JeepForum.com
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post #31 of 34 Old 04-07-2015, 11:29 AM Thread Starter
jeepguy03
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Yeah I think the medium duty springs will work best. Q-tec offers the medium in both a 605 and 405 spring rate but don't list a spring rate for the standard duty. Heavy duty is listed as 755. Hmmm.


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Previous: 1990 XJ Limited, 2000 XJ Sport, 2000 XJ Sport
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post #32 of 34 Old 04-07-2015, 12:49 PM
XJFrance
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I think this is getting into the weeds of leaf springs. The HDs have a load rating of 755lbs, but I dont think that is the same as the MAX load they can handle. The road rating, in my understanding, is the amount it can hold at a certain height.

I loaded the back of the XJ until it was 18" center to fender. Starting at about 19.5", that would mean the truck sagged down 2.5", and still had plenty of arch. So, the take away is that these babies are STIFF. After adding the helper leaf, I could bounce up and down on the hitch and it would barely move, and I am over 200#. These are not springs for someone that doesnt want feedback from the roads.

When I bought and installed them, I was excited because I wanted a little lift, and initially got it. That didnt last, which is why I caution others from viewing them from that perspective.
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post #33 of 34 Old 04-11-2015, 12:14 AM
Charley3
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Well, it's my opinion (France) that you've been overloading your XJ. It's clear that we aren't going to agree on that, so we'll have to agree to disagree.
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post #34 of 34 Old 04-12-2015, 09:25 AM
Rob K
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I have a four door 1995 4x4 with 2.5L engine and AX5 transmission. I put in Crown heavy duty springs on mine and gained 1.5" over stock. I've hauled quite heavy loads several times, but not regularly. The ride is very stiff and it has not settled in years. The shackle angle is near vertical. In hind sight I should have gone with the medium duty. At this point I can remove a leaf or install relocation brackets. Raising the front will help also since it has a fair amount of rake at this point. It's not bothersome enough for me to change it at this point. Have been driving it as is. I would agree, medium duty for the OP.

Don't expect things to work out perfectly on the first try when replacing suspension. All you can do is start by putting in new springs and adjust from there. Shackle relocation brackets will allow you to make some of the necessary adjustments. Wish I would have known about these brackets when I installed my springs. The adjustment would have been quite helpful. You can always install them after you try the new springs out.
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