Different year axle width tech:

if anybody needs to know:

79-85 : 55" WMS

86-95: 58" WMS

95.5-04: 61" WMS

ty for info, was thinking about doing a rear axle W/ disc brakes on my 82

Where did you find this info? My axle width does not match up to any of those? Where is that measured to?

wheel mounting surface

Mine is 56.5" from drum to drum. I have an '80.