WOT Junkie and avid corn burner
Join Date: Jul 2008
Location: Virginia Beach, VA
I wouldn't use the Hayden 679 cooler as the sole transmission cooler, I don't feel it's big enough for that kind of use. The only reason I use it is that I still utilize the transmission cooler in the radiator. The 679 is an auxiliary cooler. All I did was replace my radiator with another stock replacement, I think it's a Vista-Pro or something like that. It's been working for me just fine, even when driving like a bat outta hell on a 100+ degree summer day.
Michael M. ASE P2 Automobile Parts Specialist.
1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.
1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.
1998 Mustang GT premium. Trans Go shift kit, Bassani catted x-pipe, PI heads, cams, intake swap, Accufab elbow, SCT Xcal 4 tune, Eibach Pro-kit, Maximum Motorsports Caster/camber plates, fat tires. Banging audio system.