The Four-Runner and the Highlander are not the same, they are entirely different models. Which one are you asking about specifically?
A 1991 Toyota 4runner is bigger than a 1990 4runner
it does not you will have too put coneckt it your self.
In 2010 Toyota produced the 4Runner, the Avalon, the Camry, The Camry Hybrid, the Corolla, The FJ Cruiser, the Highlander and Highlander Hybrid, the Land Cruiser, the Matrix, the Prius, the Rav4, the Sequoia, the Tacoma, the Sienna, the Tundra, the Venza and the Yaris.
Toyota Highlander was created in 2000.
There is no recall for the Toyota 4runner transmission. Some Toyota's have had break problems that may have started the recall rumors on some Toyota products but, there is no recall for the Toyota 4runner transmission.
The 2014 Toyota 4Runner has a V6 engine.
The 2008 Toyota 4Runner has 24 valves.
The 2005 Toyota 4Runner has 24 valves.
The 2012 Toyota 4Runner has a V6 engine.
The 2010 Toyota 4Runner has 16 valves.
The 2006 Toyota 4Runner has 24 valves.