Outer Limits 4x4 Board

Are there some gear reduction options out there rockhopper??? other car makes models with lower transfer gears for a late 80's lux ???
Any ideas apprectated looking at building a buggie

http://www.marlincrawler.com/htm/transf ... p_dual.htm
http://www.marks4wd.com/Hilux-extra-low-tc-gears.htm
http://www.marks4wd.com/Hilux-dual-tc.htm