8-3/4 - 489 - 3.23:1 spline count...

I've been searching and reading posts and links trying to find out if there is a definitive way to determine the axle spline count at the differential / yoke on the Scamp. I'm not familiar with this hardware whatsoever.

But what I'm reading on the Moparts Tech page is that the spline count is either 29 or 10. Most likely I'm guess it to be 29. What I'm trying to figure out is ... I'm wanting to buy an Eaton Detroit TrueTrac, and it seems to state it has either 30 splines or 33 splines. So ... I'm either stuck, or I just really don't know what the heck I'm looking at.

My main question is: Without taking stuff apart and counting the splines, is there a way I can tell if it is 10 or 29 spline? I've heard the bolt head size is how to distinguish it, but I don't know which size means what.

And also, what's up with the Eaton Detroit TrueTrac? Is there a 29 spline option (I'll keep chasing it on that end too). Or am I going to have to convert something to get to a 30 spline?

There's always more to learn, seems like I never know anything.


7milesout