Remember that the steering and suspension geometry is set up for that specific center
of gravity, wheelbase, track width, ackerman angle, you will undoubtedly have to
change these measurements when converting to a buggy. And you wouldnt necessarily
want a rear solid axle buggy unless you have a decent amount of travel with a four link
setup, keep in mind the rear axle is not a three dimensionally moving object, it pivots
one way upon its axis, no room for sideloading aka flexing of the suspension. And is the
front suspension of the quad a equal or unequal length a-arm setup? the unequal length
is obviously much more desirable, and would have much more potential, if not willing to
fabricate your own a-arms and do the math for the geometry, basically, id throw
another engine in it and repair the rear swing arm, no big deal as i have broken mine
many times on my trx 450r and my kfx 400 until i decided to make my own for each,
mind you this is only my opinion, but fixing it would be better and youd probably be
more satisfied with the end result than a buggy.