[Lawrenzo]

The proper break in procedure states to change the oil in the first few hundred miles of ownership, but doesn't say anything about the rear diff fluid. Is there a suggested time frame on this as well?
It's just a road car for me so there has been no track time involved as if yet.

 

[Chuck 98 RT10]

15K to 30K depending on your driving.

 

[HP]

It might be worthwhile to change it (the first time)
after 500 to 2000 miles - for the same reasons you change
your engine oil - during breakin - the gears create more
heat and generate more metal particles.
Most new gear sets recommend 500mi for first oil change.