What radiator? Anyone have knowledge of what radiator I should use? My aftermarket aluminum radiator doesn't have an auto trans cooler so I'm going to give it to my dad for his Firebird or race car(both stick), and get a new one. JTR sells Corvette radiators for almost $200, and S10 4.3L HD radiators for about $140. Also, when I look on Summit the Howe 3" thick radiator only has 1" thick core, where as the factory Corvette one has 1.2" thick core. Now that I look JTR also has an aftermarket Corvette Replacement that is $130.