For sale is an excellent Winters #8503 quick change gear set with 25 and 31 teeth.  This is set 03 and in a 4.11 ring and pinion rear end this yields a final ratio of 5.11 and in a 4.86 ring and pinion rear this yields a final ratio of 6.02.  This is a 10 spline REM gear and very nice.  Thanks for looking and as always I combine shipping when possible.