GM’s line of Turbo-Hydramatic transmissions were some of the stoutest pieces ever fielded behind small- and big-block Chevy engines. But the TH350 and TH400 three-speed versions (and their two-speed ...

It's not a long-forgotten factory racing secret. The quickest way to move a '60s muscle car down a dragstrip faster is to equip it with a swift-shifting, close-ratio four-speed and a set of deep ...