Join Date: Mar 2010
Location: Far northern Chicago suburbs
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There are several good books discussing Turbo 400 modifications and rebuilds, they go into great detail. Also any year GM shop chassis manual that covers the 400 is a great source of info and assembly pictures. I have rebuilt a couple of 400's with good results. TCI, B&M, and others all offer comprehensive rebuild kits with most of the good stuff needed. A 34 element sprag is probably a good addition as well as an adjustable vacuum modulator. These kits also include the necessary parts and instructions for different levels of performance mods not unlike the "shift kits" that have been sold for years. You may have to fabricate a couple of tools for the clutch packs and you should have a dial indicator for end play measurements, some snap ring pliers and an inch pound torque wrench, but aside from that common hand tools are really all that's required. Common sense taking it apart, laying out the parts in order and keep it clean !! Torque converters, not my speciality, best left to people who know what they're doing, talk to a reputable vendor with your cars specs and see what they say.