Bison I like the info on the roller ware,,the larger rollers were tapered on the inner outside of cage so when i replaced the smaller roller i fliped the larger roller over putting the taper on the inside of cage,, dont no if thats a proublem ,, did the same thing on both sides,,left side has no issues.,,, need to find out the outter roller dia. and the play between the two,,and consider changing them if i have to much play id like to use a different materal,,,,, replaced 14 boggies and three axels with the new tracks all looked good ,,the front 14inch. boggie axel on right( bad side) was real stiff but didnt leak,,,,, Bolts are in same spot both sides i did try it in different holes no luck there,,,,, cant beleave swaping tracks would make a difference?????? thanx 4 your input ..Mark