99 F-350 7.3 PSD 6" superlift springs, 35 toyo load E tires, true trac front, detroit locker rear, 140 gallons fuel, Desiel-site coolant filter, 6.0 trans cooler, BDS trans, Banks billet converter, Bank trans command, Banks turbo housing, wicked II wheel, big head waste gate, Power elbow, EBCV removed, diesel-o-rings in fuel bowl. 203 t-stat,TS Performance tuner, True 4" exhaust turbo back,AIH delete,new turbo pedistal, turbine housing, More to Come when the funds come.
If you don't feel that you are slamming the rear hatch abnormally hard, then you might have a structural issue that is causing excess shock to make it to the inertia switch. I'm not positive how the switch was constructed in the 1995 model year, but Ford inertia switches in the late '80's consisted of a switch and trigger mechanism installed above a conical magnet with a steel ball bearing. There really wasn't much that could wear out in one of those to cause it to trigger prematurely unless the trigger mechanism broke.
If you don't believe you are being too rough and there are no signs of structural damage on the truck (broken welds or frame members) then you probably need to replace the inertia switch.
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