1. 5th gear lock out???

2. The reverse lockout is a slide piece that is attached to the shifter and contacts the shifter tower if not lifted.

1 is non-existant & neither 1 or 2 is related to the cables.

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Yes the cable R&R is a big PITA...

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.