Birfields coarse or fine

[allan man]

I have a 1974 FJ assuming it is all stock, DO i have fine spline birfs or coarse,how many splines? My inner axles how many splines?outers?

 

[Poser]

Coarse spline outer axle stub- 6 spline

Fine spline inner axle shaft- 30 spline

 

[allan man]

Coarse spline outer axle stub- 6 spline

Fine spline inner axle shaft- 30 spline

Geez that was fast thanks POSER
I was thinking of putting a aussie up front,in this case maybe not.

 

[bdiemer]

Aussie up front with coarse splines=Busted birf. Ask me how I know. Get some Longfields and the Aussie. I have that combo and love it.

 

[allan man]

So i guess i would have to do the mini-truck 79-85 conversion to add the longfields and at the same time gain disc brakes.Or can i just upgrade the birfields to a fine spline with the existing set- up? and then add the aussie.

 

[Poser]

So i guess i would have to do the mini-truck 79-85 conversion to add the longfields and at the same time gain disc brakes.Or can i just upgrade the birfields to a fine spline with the existing set- up? and then add the aussie.

You cannot use disc brake birfs/Longfields with US pre-08/76 drum brake spindles/wheel bearing hubs, etc. You must convert to disc brake components from a Mini, or preferably, from a 60 series, as they have larger, vented rotors.


Lots of reading in the FAQ on this topic.

 

[allan man]

You are the man!