UPDATE: Still Available.
(06/17/2023) I have no idea what these mud racer chassis are worth.
https://www.facebook.com/marketplace/item/735874405207592
“One of the top mud racing chassis around. 8 3/4 Chrysler rear end with a strange spool. With 4.56 gears and 35 spline axles. With special chain drive transfer case and Dana 44 frt diff.Set up for Chevorlet. Serious inquiries only please. Cash only”