Decoding a Yukon ring gear set

I cant seem to find online and have a call into yukon but was curious if any one had a source to de code the ring gear stamps.

It is stamped [ D5 18520 304 ] then a small space and [ 303 ]

I was told it was a 4.10 ratio, but the tag on the diff says 3.73, which might be the original tag. But i thought the break was at 3.73 so I just want to make sure this is a 4.10 for sure. i am not sure how carrier breaks work.

any leads to decoding it would help.

thanks.