Hasn't this got a bit off track?
Surely the issue isn't whether you use the same chassis - more that you can use the same chassis with some of the transmission still connected to the non-driven wheels to gain an advantage?
Simple answer - yes you can use a 4wd chassis in the 2wd class - but you must remove not only the driveshafts but any means of driving the differential on the non-driven wheels. You can leave the diff in if you like as it's only the same as having ballast in a traditional 2wd car up front - but you're not allowed to send drive to the diff.
Or is that too simple?
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