Perrfekt

Been lurking around for quite some time here. recently I started having an issue with my jeep slipping in and out of gear, but have been able to deal with it. i have adjusted the TPM and it helped slightly. Today though was another story. It decided to not start. The relay actuates just fine but the starter doesn't engage. Never had this particular problem and it seems it might be either the slave or the neutral safety switch. Any ideas? Also, I know on older cars you can manually engage the starter with a screwdriver, still possible on this guy?