Have you checked the fluid level? Sounds a lot like it could be low or have a leak. With that much slippage in there, though, you could have damage to your clutch packs. The fluid should be a rich red color if it is 'good.' If it is ready (or beyond ready) for changing, it will be more of a brownish color, and if it is dark, maybe even "black," and has a burned smell, then you likely have some major issues in the transmission.
2018 Subaru Crosstrek, 2014 Audi Q7 TDI, 2013 Subaru Forester, 2013 Ford F250 Lariat D, 1976 Ford F250, 1969 Chevrolet C20, 1969 Ford Econoline 100
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