Ford 9 inch to a quick change

[Dirtrunner35]

I'm switching to a quick change from a 9 inch, I use a 586 in the 9 inch, will I get the same rpm with the same gear in the quick change ??

[JustAddDirt]

qc

should be darn close.

[racinjj]

If the final drive ratio is the same, you will see no change. The only difference between the two is the amount of drag on one vs the other and that shouldnt affect engine RPM much.