What kind of trucks/cars can I get a traction lock differential out of that will fit in my 2001 Cobra. I have seen that Explorers all have 31 spline lockers in the rear axle and that the new Explorer has an IRS. Also do F-150's have 31 spline? Will they have no problem fitting in the Cobra/Tbird SC IRS housing? Are there any other vehicles they have these differentials? I need any help if you can give it. I would like to put a set of 4.10's in but I really would like to have an extra full center section.

Terry