Just came across this on the Downey 4x4 Website in the US.. No it is not for our current model Hilux but the previous shape tacoma's, but I thought it interesting enough to post up and to stimulate discussion on the topic.
http://www.downeyoff-road.com/ChassisComponents/MiscDriveTrain.html
So the dealer talked you into a new 4WD Toyota truck with ADD (automatic differential disconnect). Now you find yourself contending with performance loss, mileage loss, additional wear on your 4WD components (even in 2WD), and significant limitations on suspension travel and lift. Even worse, there’s no inexpensive way to install unlocking hubs on your ADD vehicle. Downey has taken a couple steps toward bringing down the price tag of converting from ADD to unlocking hubs:
First, we established ties with the off-shore suppliers of the components needed for this conversion.
Second, we assembled a bare-bones conversion kit, it does not include items from your present ADD system that can be reused with the manual hub system (i.e. you can reuse original axle shafts and wheel bearings.
Now your 1996-newer TOYOTA truck can accommodate up to 31/2” of suspension lift with virtually no CV joint buzz at freeway speeds, and you’ll get better mileage to boot!
