For sale is an excellent Winters #8509 quick change gear set with 19 and 23 teeth.  This is set 09 and in a 4.11 ring and pinion rear end this yields a final ratio of 4.99 and in a 4.86 ring and pinion rear this yields a final ratio of 5.88.  This is a 10 spline REM gear and very nice.  Thanks for looking and as always I combine shipping when possible.