Spline count

Hello, I have a 2006 Tacoma 4x4 automatic. How would I find out what the spline count is for the rear? I’m looking at a locker for the rear.

 

Looks like I’m going to find out on my own! I have to replace the rear oil seal so I’ll count it then! I bet it’s 30

 

I think it’s 30.
It’s been awhile since I had my axle out.

Let me guess, it was your left rear axle seal?

 

Close, right rear.
The diff breather was clogged. Oops

 

90% of the time it’s the left.
And mine was clogged to, which is what I suspect cased the leak.