Gold Founding Member
Join Date: Sep 1998
Location: Toronto, Ontario, Canada
Re: rare or not
Not super common, but definitely a plus. A YD1 Trailering Rear Axle, 3.31 12-bolt is desirable and is a good ratio for where it sounds like you are going with your new Chevelle. Build that TH350 well so it can live behind aggressive use from your 400. It sounds like a great package. Congrats!