My 2006 Tribute will run but not go into ANY gear. Not any of the 5 speeds or in reverse ? Is it the clutch or the gear box ? How much to repair ?

Hello, if you have a manual transmission that shifts into the appropriate gear but the clutch will not effectively "engage" to allow acceleration, then you have a clutch concern -- either a fluid issue with a hydraulic clutch issue, or a clutch disc issue. Too hard to know, but kind of sounds like a hydraulic concern since it happened all at once. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops