basically, lock the diff? sure... take a sheet of binder paper, cut two circles the size of the large blue gear inside the diff, insert paper pieces into diff and re-assemble. yes, the diff pin should go straight through those pieces of paper.
simple, and temporary if you find you don't like the locked diff feel.
or do you actually want a whole, sprung, solid axle like a muscle car? for that, you might as well adapt the rear pod of a mini-z to your xmod.
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