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if your trans was slipping badly then its usually bad to increase the line pressure (what shiftplus does) because it puts extra strain on trans parts and often smokes it faster..the grinding is probably your transmission on its way out.
NOT SAYING THIS IS 100% TRUE!
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2004 Audi TT Quattro 1.8t 
1969 Chevrolet Biscayne 2d
1963 VW Beetle
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