Last year, Tone Box released a uniquely menacing overdrive unit shaped like a human skull where red LEDs lit up the orb sockets. Now the company has announced a new Skull Crusher in steel or gold ...

Here is the 30-percent B&J overdrive and installation kit (no adapter is required for Turbo Hydra-matic 400 transmissions). Included in the kit is a vent canister (that must be located a minimum of 12 ...

These days, some people think the best way to fix this is to swap in a more modern overdrive (OD) transmission, but there are downsides to this plan. Older OD transmissions, like the 700-R4, can ...

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 ...

An overdrive is one of the biggest improvements you can make to a Series Land Rover, raising its cruising speed and making it more relaxed to drive. Both those factors will improve your safety on the ...