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There is more of a difference in a 450 and a 400 that just the motor, handle bars,front bumper.
From what i've experienced with redoing the ol' foreman with 450 parts i've fount out what fits and whats don't.
Front bumper off a 450 will fit a 400 but not everything bolts up right up
Foreman 450 a arms do not fit a 400 because the tops are too wide, also the a arms on a 450 are 2 inches longer than a 400
Foreman 450 cv's are the same but the cv cup is 2 inches longer than a 400
Foreman 450 ball joints are bigger and do not fit in the 400 a arms.  To solve this u will either have to cut the 450 a arms up to fit(what i've done) or drill out the a arms for the ball joints to fit.
Foreman 450 tie rods are 2 inches longer
Foreman 450 front drive shaft does not fit because it's too big around and is not long enough
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