rear disc from grand cherokee on a 8 3/4

is it the narrow flange width on the a body axel that is causing the caliper, disk alignment problem?
"note below was copied brom a internet posting"
Besides the obvious bolt circle lug pattern difference between the A-body 4" BC axle and
all other passenger car 4.5" BC axles, there is a sometimes unexpected difference in the
flange that tends to cause confusion. The distance from the axle housing flange to the
wheel flange of the axle is 1/4" smaller on A-body axles than on the standard 4.5"​
passenger car axle. On an A-body axle this measures 2", on 4.5" BC axles its 2.25".