New developments in Thin Gap Chambers (TGC) detectors to provide fast trigger and high precision muon tracking under sLHC conditions are presented. The new detectors are shown to stand a high total irradiation dose equivalent to 6 Coulomb/cm of wire, without showing any deterioration in their performance. Large (1.2 × 0.8 m²) prototypes containing four gaps, each gap providing pad, strips and wires readout, with a total thickness of 50 mm, have been constructed. Their local spatial resolution has been measured in a 100 GeV/c muon test beam at CERN. At perpendicular incidence angle, single gap position resolution better than 60 μm has been obtained. For incidence angle of 20 degrees resolution of less than 100 μm was achieved. TGC prototypes were also tested under a flux of 10⁵ Hz/cm² of 5.5-6.5 MeV neutrons at SOREQ Nuclear Research Center, showing a high efficiency for cosmic muons detection.