I pulled the 8 3/4 center section on my wife's 1971 R/T Challenger today.

I had previously done the spin test and was pretty sure it was 4.10 ratio.

Well I guess I was close.
In looking at the stampings it appears to be 4.11 ratio.
I thought 8 3/4 rear ends only had 4.10?

The center section is a 489 with cone type Sure Grip.

Am I missing something in checking the stampings?