For sale is an excellent Winters #8504A quick change gear set with 18 and 23 teeth.  This is set 04A and in a 4.11 ring and pinion rear end this yields a final ratio of 5.26 and in a 4.86 ring and pinion rear this yields a final ratio of 6.21.  This is a 10 spline gear and in excellent condition.  Thanks for looking and as always I combine shipping when possible.