I was wandering could I change the rear shock off of my quad with a rear shock from another quad? If so what could i swap it out with?

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z400 rear shocks only work on the 91+style swing arms. it wont even work on my 90. the 85-86 are very limited. and I do not believe there are any to fit that style. I ended up getting my stock one rebuilt. I would recommend doing the same. If your going to put forth the effort into swapping a shock you might as well also change out that weak 85-86 swing arm if you have not done so already.