This is not mine. I ran across it yesterday on Craigslist. I'm just p***ing it along for anyone who might be building a period correct trifive g***er. This bolts right into a trifive. https://phoenix.craigslist.org/evl/pts/d/maricopa-1957-pontiac-rear-end-axle-***y/7615243646.html
The Jalopy Journal
