8 3/4...School Me...

ckj688, your third pic shows the numbers on the case. The last three digits are 489. No guesswork required on that.

I think 65barracudadude was talking specifically about the Dana SG unit that often came in the 741 case. They can be used in the other cases and work very well. As far as the 741 case goes, I have not broken any of them....741, 489 or 742. The 742 is my favorite because of it's big bearing.....