I have that same transmission & it requires a lower axle ratio than someone inexperienced with that transmission would assume would be appropriate. For 32" which is close enough to 33" for government work, I'd go with 4.88. The issue with the 42RLE transmission which you & I both run is it has such an unusually high Overdrive ratio, .69, that it requires an unusually low axle ratio to compensate. 4.88. Really.