Make sure if you ever shorten a diff it is always best to not machine and respline axles at the factory the spline is rolled compressing and strengthening the metal and it is then correctly heat treated afterwards,they certainly are not doing it properly for even $250.00
You can shorten a diff by using the short axle trick but do not reverse the rotation of the axle from it's original fitted position and buy a new genuine replacement for the other one,that way you will not encounter stress reversal which will cause a failure and you will have 2 rolled spline heat trteated bulletproof axles.