Up for sale is an equivalent IR 3940-TK1 Tune Up Kit. This quality kit fits IR model 3940 1?/ spline dr. D HANDLE impact wrench. The new parts are OEM IR or CP from either IR or CP or from an IR or CP manufacturing contractor. These parts with proper ordering are guaranteed to fit and work. A quality kit that works! These kits have all the ?soft parts? for the throttle and air motor (also includes motor bearings) and a socket retainer and oring for the shank. This kit has phenolic blades to replace the OEM blades. Some signs of needing a rebuild would be the obvious loss of power or that persistent air leak. The nice part is the IR 3940 D HANDLE is a fairly easy tool to rebuild and this kit will put your gun back at the top of your shop! Warranty would only apply to proper install of parts! Usually ships in 24 hours!