Just the entire rear suspension fitting for starters. The vehicle uses its original diff and driveshaft, but from the trailing arms fittings which fit onto the tube to the shocks fittings which mount onto the frame/rollcage everything is locally designed and fabricated with limited guidance. The rollcage itself (although a bit of an imperfect frankenstein by now) holds the stock frame from the nose to the tail and is also locally made. The four link geometry and angles were essentially figured out between Shabab, Ali Zafar and Hafiz "Barati" with limited guidance from the manufacturers. To date there are no reported issues on any welding/fabrication AH.
The trailing arms themselves are firstly no "genuine" invention (at least in this application) and the design is perhaps an American contraption perfected over years of use and experience. These particular trailing arms were purchased from ORW as plates which were welded together locally. You can check on the net now but up until a year ago this was one was one of the few Tundras with a full trailing arm kit. Hence a unique vehicle anywhere in the world and cutting edge stuff in its own right.
