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Unread 10-09-2003, 04:47 PM   #1
jmbrowning
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Unibody design = Designed obsolescence?

The Missus has it in her mind to pick up an XJ for mod off-roading and backup duty to the Subi Outback for daily driver use. XJ's are pretty common and pretty cheap around here.

I have a concern about the unibody design though. Unlike the tub on frame designs which seem to last forever, until the tub gets replaced, the unibody seems to be susceptible to fatigue and flexing.

How long does the unibody last before it flexes so much that the doors and hatch don't close anymore? Should the Wife get a new XJ and get the chassis reinforced before any lifting or off-roading occurs?

Admittedly, being as inexpensive as they are, could just part out the rubber XJ and slap the saved parts in another one.

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Unread 10-09-2003, 05:12 PM   #2
JTruel
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If you are worried, do what drag racers do

Build a set of longitudinal support braces (subframe connectors) and weld them in... Cherokees already have a similar thing, but extra insurance wouldn't hurt... and unibodies hold up fairly well UNTIL they get wrecked. I have a 63 falcon and its a unibody... so they can last
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Unread 10-09-2003, 05:15 PM   #3
cheesycook
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An XJ is actually Uniframe so it has some reinforcement. I don't know how long they last, unless you are doing serious flexing it shouldn't be a problem. Body stiffiners are a good idea just in case. I have been looking for something myself.
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