What is the difference between the 79-85 rear axle as apposed to the 86-95? Planning on putting toyota axles under my suzuki sidekick and was wondering why the place I am thinking about ordering the kit from said I needed different year axels

http://www.trailtough.com/default.htm

Click on product listings
then on SideKick/Tracker Parts


87 Toyota 4Runner-RV Head, Custom Grind Cam, Doug Thorley Header, Keith Black Pistions, 2 1/4" Magnaflow cat, Dynomax Exhaust
2003 Toyota Matrix XRS-Injen CAI